spearhead
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C1 verb /ˈspɪərˌhɛd/

spearhead

先導する
Meaning
to lead or initiate an action, project, or movement
Example
She spearheaded the campaign for environmental awareness.
彼女は環境意識のキャンペーンを先導しました。
A2 noun /stoʊn/

stone

石
Meaning
a hard, naturally occurring mineral material found in the earth
Example
He threw a stone into the lake.
彼は湖に石を投げました。
C1 adjective /ˈstrætɪfaɪd/

stratified

Meaning
arranged or classified in layers or strata
Example
Society in the past was highly stratified based on class and wealth.
B1 noun /swiːt pəˈteɪtoʊ/

Sweet potato

さつまいも
Meaning
A root vegetable with sweet flesh, typically orange or purple in color
Example
Roasted sweet potato makes a healthy and delicious side dish.
ローストさつまいもは健康的でおいしいサイドディッシュを作ります。
B2 noun /ˈsɪmbəl/

Symbol

シンボル
Meaning
a mark or character used as a conventional representation of an object, function, or process
Example
The dove is a symbol of peace.
鳩は平和の象徴です。
C1 noun ˈsɛlf pəˈzɪʃən

self-possession

自己抑制
Meaning
The quality of being calm and confident and in control of one's emotions; composure.
Example
His self-possession during the crisis was remarkable.
彼の危機的な状況での自己抑制は素晴らしかった。
C1 verb /ˈswɛltər/

swelter

強烈な暑さで苦しむ
Meaning
to suffer from intense heat
Example
We began to swelter in the midday sun.
私たちは真昼の太陽の下で汗だくになり始めました。
A1 noun /snoʊ/

Snow

幸せ
Meaning
white frozen water that falls from clouds as soft flakes
Example
The children played happily in the fresh snow.
子供たちは新鮮な雪の中で楽しそうに遊んでいました。
C1 adjective /sɪˈnɒnɪməs/

synonymous

同義語
Meaning
having the same or nearly the same meaning; closely associated with something
Example
For many people, her name is synonymous with generosity.
多くの人にとって、彼女の名前は寛大さの同義語です。
C2 adjective /ˈsætərˌnaɪn/

saturnine

陰気な
Meaning
slow and gloomy in mood
Example
His saturnine expression made everyone in the room uncomfortable.
彼の陰気な表情は部屋の中の誰もが不快に感じさせた。
B2 noun, verb /slænt/

slant

偏った見解
Meaning
A particular point of view; to slope or lean in a particular direction.
Example
The article had a political slant.
その記事には政治的な傾向がありました。
C2 noun /skʌlˈdʌɡəri/

skulduggery

不正行為
Meaning
underhanded or dishonest behavior
Example
The politician was accused of financial skulduggery.
その政治家は金融詐欺で告発された。
B2 noun ˈsʌbstɪˌtut

substitute

代用品
Meaning
A person or thing acting or serving in place of another.
Example
Money cannot be a substitute for genuine happiness.
お金は本物の幸せの代用品にはなりません。
B2 noun /sɪɡˈnɪf.ɪ.kəns/

Significance

重要性
Meaning
the quality of being worthy of attention; importance
Example
The discovery has great significance for medical research.
その発見は医学研究にとって大きな意義があります。
C2 noun /ˈstænʃən/

stanchion

支柱
Meaning
a strong upright bar or post used as support or to control movement
Example
The red rope was attached to the stanchions to guide the crowd.
赤いロープは群衆を導くためにスタンションに取り付けられていた。
C1 adjective ˌsʌbˈlɪm.ɪ.nəl

subliminal

意識の閾値以下で存在または作用し、無意識に心に影響を与える
Meaning
Existing or operating below the threshold of consciousness; perceived by or affecting someone's mind without their being aware of it.
Example
Advertisements often have subliminal messages.
広告にはしばしばサブリミナルメッセージが含まれています。
A2 modal verb /ʃæl/

shall

〜するつもり
Meaning
used to express the future or indicate an intention or determination
Example
I shall return before sunset.
私は日没前に戻ります。
B2 verb /snæp/

snap

折れる
Meaning
to break suddenly; to speak angrily; to take a photograph quickly
Example
The rope snapped under the weight.
ロープは重さで折れました。
C2 adjective /ˈsfɪŋks laɪk/

sphinx-like

神秘的な
Meaning
Mysterious, enigmatic, or difficult to interpret
Example
Her sphinx-like smile made it hard to guess what she was thinking.
彼女のスフィンクスのような微笑みは、彼女が何を考えているのかを予測するのを難しくさせた。
C1 verb /ʃɜːrk/

shirk

避ける
Meaning
to avoid or neglect a duty or responsibility
Example
He always tries to shirk his responsibilities at work.
彼は仕事で責任を避けようといつも試みます。
B1 noun /ˈʃel.tər/

Shelter

避難所
Meaning
a place giving temporary protection from bad weather or danger
Example
The hikers found shelter in a cave during the heavy rain.
ハイカーたちは大雨の間、洞窟の中に避難所を見つけた。
B1 adjective /ˈsekənderi/

secondary

二次的
Meaning
Less important than something else; derived from or dependent on something primary.
Example
Safety is our primary concern, while speed is only secondary.
安全は私たちの最優先事項であり、速度は二次的なものです。
B2 adjective /səˈpɔːtɪv/

supportive

支援的な
Meaning
providing encouragement or emotional help to someone
Example
She was very supportive during my difficult times.
彼女は私の困難な時期に非常に支援的でした。
C1 adjective /səˈdʒɛstɪv/

suggestive

示唆的
Meaning
tending to suggest ideas or images; sometimes implies something sexual or provocative
Example
The painting was highly suggestive and sparked much debate.
その絵画は非常に示唆的で、たくさんの議論を引き起こしました。
C1 adjective /ˈstraɪ.dənt/

strident

耳障りな, うるさい
Meaning
loud and harsh; presenting a point of view in a forceful way
Example
His strident voice made the debate uncomfortable.
彼の耳障りな声は議論を不快にした。
C2 noun /ˈstrɪndʒənsi/

stringency

厳格さ
Meaning
the quality of being strict, precise, or severe
Example
The stringency of the new rules surprised everyone.
新しい規則の厳格さはみんなを驚かせました。
A2 adverb /ˈsʌm.taɪm/

sometime

そのうち
Meaning
at a time that is not known or stated; occasionally
Example
Let's meet for coffee sometime next week.
来週のどこかでコーヒーを飲むために会おう。
B2 adjective/noun /staʊt/

stout

丈夫 / ぶ厚い
Meaning
Strong, thick, or heavily built; also a kind of dark beer
Example
The stout man lifted the heavy box with ease.
その丈夫な男性は重い箱を簡単に持ち上げました。
B2 noun /spæn/

span

スパン
Meaning
the full extent or length of something from one end to another
Example
The bridge has a span of over 500 meters.
橋のスパンは500メートル以上です。
C1 /skwɒt/

squat

しゃがむ
Meaning
to crouch or sit with knees bent and body close to the ground
Example
He squatted down to tie his shoes.
彼は靴を結ぶためにしゃがんだ。
B2 adjective /swɪft/

swift

Meaning
moving very quickly; happening promptly
Example
The river current was swift after the heavy rain.
B2 noun /ˈspɛʃəlti/

specialty

専門
Meaning
a particular area of study, work, or interest; something in which a person or place excels
Example
Her specialty is pediatric medicine.
彼女の専門は小児科医学です。
A2 noun /saɪt/

sight

視力
Meaning
the ability to see or something that is seen
Example
The sight of the sunset took her breath away.
夕日の光景は彼女を驚かせた。
A1 noun/adjective /saʊθ/

south

南
Meaning
the direction towards the bottom of a map, opposite to north
Example
The sun rises in the east and sets in the south.
太陽は東で昇り、南で沈みます。
B2 adverb /ˈsmɑːt.li/

Smartly

賢く; スタイリッシュに; 速く
Meaning
in a clever or intelligent way; neatly and stylishly; quickly
Example
He was smartly dressed for the business meeting.
彼はビジネスミーティングのためにスマートに服を着ていました。
C2 noun /sɒmˈnæmbjʊlɪst/

somnambulist

夢遊病者
Meaning
A person who sleepwalks.
Example
The somnambulist wandered out of the house at night.
夢遊病者は夜に家を出た。
C1 adjective /ˈstɒdʒi/

stodgy

退屈な、時代遅れな
Meaning
Dull, uninspired, or old-fashioned; also heavy and hard to digest when referring to food.
Example
The lecture was so stodgy that many students struggled to stay awake.
その講義はあまりにも退屈で、多くの学生が目を覚ますのに苦労しました。
C1 noun /skɪt/

skit

寸劇
Meaning
a short, humorous performance or piece of writing
Example
The students performed a funny skit at the event.
学生たちはイベントで面白い寸劇を演じました。
B2 noun /səˈnɛərioʊ/

scenario

可能な状況
Meaning
a possible situation or sequence of events
Example
The company prepared for the worst-case scenario.
会社は最悪のシナリオに備えました。
B2 noun speɪs ɪksplɔːˈreɪʃən

space exploration

宇宙探査
Meaning
The investigation of outer space by means of manned and unmanned spacecraft.
Example
Space exploration has expanded our knowledge of the universe.
宇宙探査は私たちの宇宙に対する知識を広げました。
B2 noun /ˈsɛnət/

senate

セナト
Meaning
a legislative or governing body, typically the upper chamber in a bicameral legislature
Example
The senate voted in favor of the new healthcare bill.
セナトは新しい医療保険法案に賛成票を投じました。
B2 noun /ˈswɒl.oʊ/

Swallow

ツバメ
Meaning
a small migratory bird with long wings and a forked tail
Example
The swallow built its nest under the roof.
ツバメは屋根の下に巣を作りました。
B1 verb /spɛl/

spell

スペルする
Meaning
to write or name the letters of a word in order; to mean or result in something
Example
Can you spell your name for me?
あなたの名前を私のためにスペルできますか？
C2 noun /ˈsweɪʒən/

suasion

説得
Meaning
the act of persuading or influencing someone
Example
The leader used gentle suasion to win support for the plan.
リーダーは計画への支援を得るために穏やかな説得を使用しました。
B1 noun ˈstrʌɡ.əl

struggle

闘争
Meaning
A forceful or violent effort to get free of restraint or resist attack; a determined effort under difficult circumstances.
Example
The struggle for independence united the nation.
独立のための闘争が国を団結させた。
C1 verb /ˈskwɒndər/

squander

浪費する
Meaning
to waste money, time, or opportunities in a careless way
Example
He squandered his inheritance on gambling.
彼はギャンブルに遺産を浪費した。
C1 noun /ˈstɪmjʊlənt/

stimulant

興奮剤
Meaning
A substance that raises levels of physiological or nervous activity in the body.
Example
Coffee is a common stimulant that helps people stay awake.
コーヒーは一般的な興奮剤で、人々が目を覚ますのを助けます
C1 adjective /ˌsɛrənˈdɪpɪtəs/

serendipitous

偶然の幸運
Meaning
Occurring or discovered by chance in a happy or beneficial way.
Example
Their meeting at the café was purely serendipitous.
カフェでの彼らの出会いは完全に偶然の幸運でした。
B2 noun /ˈsɪnˌdroʊm/

syndrome

症候群
Meaning
a group of symptoms that occur together and characterize a condition or disease
Example
Down syndrome affects a person's physical and mental development.
ダウン症は、個人の身体的および精神的な発達に影響を与えます。
B2 verb /ˈstɑːrtl/

startle

驚かせる
Meaning
To surprise or frighten someone suddenly.
Example
The loud noise startled the children.
大きな音が子供たちを驚かせた。
B2 adjective /ˈsʌb.sɪ.kwənt/

subsequent

その後の
Meaning
Coming after something in time; following in time or order.
Example
Subsequent events clarified the outcomes.
その後の出来事が結果を明らかにしました。
C1 adjective /səˈtɪrɪkəl/

satirical

風刺的
Meaning
containing or using satire to criticize or mock
Example
The satirical cartoon mocked the government's new policy.
その風刺的な漫画は政府の新しい政策を嘲笑しました。
C1 noun /ˈʃʊɡ.ər ˈkæn.di/

Sugar candy

シュガーキャンディ
Meaning
crystallized sugar formed into small pieces; rock candy made from sugar syrup
Example
The children enjoyed eating colorful sugar candy at the festival.
子供たちは祭りでカラフルなシュガーキャンディを食べて楽しみました。
B1 noun sɪˈkjʊə.rɪ.ti

security

セキュリティ
Meaning
The state of being free from danger, threat, or loss.
Example
Food security is essential for human survival.
食料安全は人類の生存にとって不可欠です。
B1 adverb /ˈsekəndli/

secondly

次に
Meaning
Used to introduce the second point in a list of arguments or ideas.
Example
Firstly, we need funding; secondly, we need a strong team.
まず、資金が必要です；次に、強力なチームが必要です。
B1 adjective /skɪld/

Skilled

熟練した
Meaning
having or showing the knowledge, ability, or training to perform certain activities or work well
Example
He is a skilled carpenter who can build beautiful furniture.
彼は美しい家具を作ることができる熟練した大工です。
B2 phrase ˈsɛvən ˈhæbɪts

seven habits

七つの習慣
Meaning
Regular behaviors or actions that are done consistently over time, specifically referring to a set of seven key practices.
Example
Even habits help in maintaining a balanced lifestyle.
習慣はバランスの取れたライフスタイルを維持するのに役立ちます。
C2 noun /ˈʃʊərəti/

surety

保証人
Meaning
a person who takes responsibility for another's performance of an undertaking, such as appearing in court or paying a debt
Example
The landlord required a surety before renting the apartment.
家主はアパートを貸す前に保証人を要求しました。
C2 adjective /ˈstraɪ.eɪ.tɪd/

striated

縞目模様の
Meaning
marked with thin lines, grooves, or stripes
Example
The muscle fibers appeared striated under the microscope.
顕微鏡で筋肉の繊維が縞目模様のように見えました。
C1 verb /ˈskʌr.i/

scurry

速く走る
Meaning
To move quickly with short, hurried steps.
Example
The mice scurried across the kitchen floor when the lights turned on.
ライトがついたとき、ネズミたちはキッチンの床を速く走った。
B2 noun /ˈsoʊlər ɪˈklɪps/

Solar eclipse

日食
Meaning
an eclipse in which the sun is obscured by the moon passing between it and the earth
Example
The solar eclipse will be visible from our city next month.
来月、私たちの街から日食が見ることができます。
B2 verb /ˈʃætər/

shatter

壊れる
Meaning
To break suddenly into many small pieces.
Example
The glass will shatter if you drop it.
ガラスは落とすと壊れる。
B1 noun /ˈsɜːdʒəri/

surgery

Meaning
a medical procedure involving the cutting of the body to treat a condition
Example
She underwent surgery to remove the tumor.
C1 adjective/verb /ˈsiːzənd/

seasoned

経験豊富な / 味付けされた
Meaning
Experienced in a particular activity; also, flavored with spices.
Example
She is a seasoned teacher with over 20 years of experience.
彼女は20年以上の経験を持つベテランの教師です。
A2 noun /ˈsɪl.vər/

Silver

銀
Meaning
a shiny white precious metal used for making jewelry and ornaments
Example
The silver ring sparkled in the sunlight.
銀の指輪は日光で輝いていました。
C1 adjective səˈsaɪ.ə.təl

societal

社会的
Meaning
Relating to society or social relationships.
Example
Societal benefits of space tourism are under debate.
宇宙観光の社会的利点が議論されています。
B2 verb /sɔːr/

soar

高く飛ぶ / 急増する
Meaning
to fly or rise high in the air; to increase rapidly or dramatically
Example
The eagle soared high above the mountains.
ワシは山々の上を高く飛びました。
C1 adjective /ˈsɒmbər/

somber

陰気
Meaning
Dark or dull in color or tone; gloomy or serious.
Example
The funeral had a somber atmosphere.
葬式には暗い雰囲気がありました。
A2 adjective /ʃaɪ/

Shy

内気な; 恥ずかしがり屋
Meaning
nervous or timid in the company of other people
Example
The shy student rarely spoke up in class discussions.
内気な学生はクラスディスカッションでほとんど話さなかった。
B1 noun /ˈspeʃəlɪst/

Specialist

専門家
Meaning
a person who has specialized knowledge or training in a particular area; an expert
Example
She consulted a heart specialist about her condition.
彼女は自分の状態について心臓専門医に相談しました。
C1 noun /ˈʃrɪŋkɪdʒ/

shrinkage

収縮
Meaning
The process of becoming smaller in size, amount, or value.
Example
The company reported a shrinkage in profits this quarter.
その会社は今四半期の利益の収縮を報告しました。
B2 verb /soʊk/

soak

浸す
Meaning
to make something completely wet by immersing it in liquid
Example
She soaked the clothes in water before washing them.
彼女は洗濯する前に服を水に浸しました。
C2 verb /ʃiːð/

sheathe

鞘に戻す
Meaning
to put a sword or knife back into its cover
Example
He quickly sheathed his sword after the duel.
彼は決闘の後、素早く剣を鞘に戻した。
C1 verb/noun /skɒtʃ/

scotch

終わらせる / スコッチウイスキー
Meaning
to put an end to something; also a type of whisky
Example
The report scotched the rumors of a merger.
報告書は合併の噂を終わらせました。
B2 verb /straɪv/

strive

努力する
Meaning
To make great efforts to achieve or obtain something.
Example
She strives to be the best student in her class.
彼女はクラスで最も優れた生徒になるよう努めている。
C1 noun /ˈsɑːri/

Saree

サリー
Meaning
a garment consisting of a length of cotton or silk elaborately draped around the body, traditionally worn by women from South Asia
Example
She looked elegant in her red silk saree at the festival.
彼女は祭りで赤い絹のサリーを着てとてもエレガントに見えました。
B1 noun /ˈsʌn.set/

Sunset

夕日
Meaning
the time in the evening when the sun disappears below the horizon
Example
The romantic sunset painted the sky in golden colors.
ロマンチックな夕日が空を黄金色に塗りつけました。
B2 adjective /ˈstʌdid/

studied

慎重な
Meaning
carefully considered, deliberate, or planned
Example
Her response was calm and studied, not impulsive.
彼女の返答は冷静で慎重であり、衝動的ではなかった。
B2 noun /spekˈteɪtər/

Spectator

観客
Meaning
a person who watches at a show, game, or other event; an observer
Example
The stadium was filled with excited spectators.
スタジアムは興奮した観客でいっぱいでした。
B2 noun /ˈspəʊksmən/

spokesman

スポークスマン
Meaning
a person who speaks on behalf of others, especially for a group or organization
Example
The spokesman addressed the crowd during the rally.
スポークスマンは集会中に群衆に向かって話した。
B1 adjective /ˈsensəbəl/

Sensible

賢明な; 実用的な; 理にかなった
Meaning
having or showing good sense; practical and reasonable
Example
It would be sensible to take an umbrella because it might rain.
雨が降るかもしれないので、傘を持っていくのは賢明です。
C2 noun /ˈskʌl.i.ən/

scullion

台所の使用人
Meaning
a servant assigned the most menial kitchen tasks
Example
In medieval times, a scullion was responsible for cleaning pots and pans.
中世の時代、スカリオンは鍋やフライパンを掃除する責任がありました。
C2 adjective /ˈstɪdʒiən/

stygian

暗黒
Meaning
extremely dark, gloomy, or forbidding
Example
They walked through the stygian cave with torches.
彼らは松明を持って暗黒の洞窟を歩いていました。
C1 noun /sərˈveɪər/

surveyor

測量士
Meaning
A person who measures and maps land, buildings, or other features.
Example
The surveyor measured the land for construction.
測量士は建設のために土地を測定した。
A2 adjective /ʃɑːrp/

Sharp

鋭い; 強烈な; 突然で強い; 理解が速い
Meaning
having a cutting edge or point; sudden and intense; quick to understand
Example
The knife has a very sharp blade.
ナイフは非常に鋭い刃を持っています。
A1 noun /ˈʃɒpɪŋ/

shopping

ショッピング
Meaning
the activity of going to shops to buy things
Example
She spent the afternoon shopping for clothes.
彼女は午後に服を買うためにショッピングをして過ごしました。
B2 noun /ˈsɪnənɪm/

Synonym

同義語
Meaning
a word or phrase that means exactly or nearly the same as another word or phrase in the same language
Example
Happy and joyful are synonyms.
ハッピーとジョイフルは同義語です。
C1 adjective /ˈsiːzənəbəl/

Seasonable

季節に適した
Meaning
occurring at the right time; appropriate for the season; timely
Example
The seasonable rain helped the farmers with their crops.
季節の雨が農家の作物を助けました。
B1 noun səˈplaɪ

supply

供給。サプライ。
Meaning
A stock or amount of something supplied or available for use.
Example
Supply chains ensure resource availability.
サプライチェーンは資源の利用可能性を確保します。
C2 noun /ˈsɪŋ.krə.ni/

synchrony

シンクロニシティ
Meaning
Coordination in time, harmony in action or movement.
Example
Their dance performance showed perfect synchrony.
彼らのダンスパフォーマンスは完璧なシンクロニシティを示しました。
B2 noun /ˈsiː.mən/

Seaman

船員
Meaning
a person who works on a ship; sailor
Example
The experienced seaman navigated the ship through the storm.
経験豊富な船員は嵐の中で船を操縦しました。
B2 noun/verb /ˈsɜːveɪ/

survey

調査, アンケート
Meaning
noun: an examination or inspection; verb: to examine or measure (an area or subject)
Example
They conducted a survey to understand customer preferences.
彼らは顧客の好みを理解するために調査を行いました。
B1 verb /ˈstɒpɪŋ/

stopping

停止
Meaning
Coming to a halt or pause.
Example
The ship is stopping at the Falkland Islands.
船はフォークランド諸島で停泊しています。
B2 noun /spæm/

spam

スパム
Meaning
unsolicited or unwanted electronic communication, typically in the form of email
Example
My inbox is full of spam emails that I need to delete.
私の受信箱はスパムメールでいっぱいで、削除する必要があります。
A2 adverb /ˈsɪə.ri.əs.li/

seriously

真剣に
Meaning
in a solemn or thoughtful manner
Example
She took the matter very seriously.
彼女はその問題を非常に真剣に取り扱った。
A2 noun /ˈsoʊldʒərz/

soldiers

Meaning
members of an army who serve their country in war or peace
Example
The soldiers marched proudly down the street.
A1 noun /sɛpˈtɛmbər/

september

9月
Meaning
The ninth month of the year in the Gregorian calendar
Example
My birthday is in September, and I always celebrate it with friends.
私の誕生日は9月で、いつも友達と一緒に祝います。
A1 verb /stænd/

stand

立つ
Meaning
to be in an upright position; to tolerate or endure
Example
Please stand up when the teacher enters.
先生が入る時に立ってください。
B2 noun /ˈstrʌk.tʃərz/

structures

構造物
Meaning
Buildings or other objects constructed from several parts.
Example
The region has ancient structures.
その地域には古代の構造物があります。
C2 adjective /ˈsæpɪd/

sapid

美味しい
Meaning
Having a pleasant taste; flavorful.
Example
The chef prepared a sapid dish that delighted everyone at the table.
シェフはテーブルの全員を喜ばせる美味しい料理を準備しました。
C2 verb, adjective /ˈstraɪeɪt/

striate

縞模様にする
Meaning
to mark with stripes or grooves; striped or streaked in appearance
Example
The rock surface was striated by glacial movement.
氷河の動きによって岩石の表面に縞模様ができました。
B2 adjective /ˈspaɪ.rəl/

Spiral

螺旋
Meaning
winding in a continuous curve; helical
Example
The spiral staircase led to the top floor.
螺旋階段は最上階に通じていました。
C1 noun səˈsteɪnəbəl ˈpræktɪsɪz

sustainable practices

持続可能な実践
Meaning
Methods and activities that can be maintained over time without depleting natural resources or harming the environment.
Example
Sustainable practices are vital for environmental preservation.
持続可能な実践は環境保護にとって重要です。
B1 adjective /sɪˈlek.tɪd/

selected

選ばれた
Meaning
carefully chosen from a group for a particular purpose
Example
He was one of the selected candidates for the scholarship.
彼は奨学金のために選ばれた候補者の一人でした。
B2 noun /ˈsʌfərɪŋ/

suffering

苦しみ
Meaning
the state of undergoing pain, distress, or hardship
Example
They tried to relieve his suffering with medicine.
彼らは薬で彼の苦しみを和らげようとした。
B1 verb /skɪp/

skip

スキップする
Meaning
to omit or pass over something; to move lightly or quickly
Example
He decided to skip breakfast and go straight to work.
彼は朝食をスキップして、仕事に直接行くことに決めました。
B2 noun ˌspɛk.jʊˈleɪ.ʃən

speculation

投機
Meaning
Investment in stocks, property, or other ventures in the hope of gain but with the risk of loss.
Example
Stock market speculation can lead to high volatility.
株式市場のスペキュレーションは高いボラティリティを引き起こす可能性があります。
C2 adjective /ˈsʌb.æs.ɪd/

subacid

やや酸っぱい
Meaning
Slightly sour or acidic in taste or nature.
Example
The fruit had a subacid flavor that was refreshing on a hot day.
その果物はやや酸っぱい味がして、暑い日にさっぱりとした味わいだった。
B2 adjective /ˈsɒl.ɪ.ter.i/

Solitary

孤独; 孤立; 一人
Meaning
alone; without companions; single; isolated
Example
He lived a solitary life in the mountains.
彼は山中で孤独な生活を送っていました。
B1 noun /ˈsteɪtəs/

status

地位
Meaning
the social or professional position or condition of someone or something
Example
His social status improved after the promotion.
昇進後、彼の社会的地位は向上しました。
A2 noun /ˈstjuːdiəʊ/

studio

スタジオ
Meaning
a room where an artist, photographer, musician, or broadcaster works
Example
The singer recorded her new song in the studio.
歌手はスタジオで新しい曲を録音しました。
C1 verb /ˈstaɪfəld/

stifled

抑える
Meaning
to suppress, hold back, or prevent something from happening
Example
He stifled a laugh during the serious meeting.
彼は真面目な会議中に笑いを抑えた。
C1 noun ˌsɪs.təˈmæt.ɪk ˈstræt.ə.dʒi

systematic strategy

体系的戦略
Meaning
A methodical and organized plan or approach to achieve specific objectives.
Example
A systematic strategy was employed to achieve objectives.
目標を達成するために体系的戦略が採用されました。
C1 adjective /stjuːˈpɛndəs/

stupendous

素晴らしい
Meaning
extremely impressive; amazing in size, degree, or excellence
Example
The magician’s performance was simply stupendous.
マジシャンのパフォーマンスはまさに素晴らしいものでした。
C1 verb/noun /ˈswæɡ.ər/

swagger

自信過剰
Meaning
To walk or behave in a very confident and arrogant way.
Example
He swaggered into the room as if he owned the place.
彼はまるでその場所のオーナーであるかのように部屋に入ってきました。
C1 adjective /ˈsɪm.jʊ.leɪ.tɪd/

simulated

シミュレートされた
Meaning
Artificially created to look real but not actually real.
Example
The pilot trained in a simulated flight environment.
パイロットはシミュレートされた飛行環境で訓練しました。
A2 noun /saɪz/

size

サイズ
Meaning
the physical dimensions, proportions, or magnitude of something
Example
This shirt is too small in size for me.
このシャツは私にはサイズが小さすぎます。
C1 verb /slɪŋk/

slink

忍び寄る
Meaning
to move quietly and secretly, often to avoid being noticed
Example
The cat slunk into the room without making a sound.
その猫は音を立てずに部屋に忍び込んだ。
A2 verb /səˈpəʊz/

suppose

仮定する
Meaning
to assume or believe something is true without proof
Example
I suppose she will be here soon.
私は彼女がすぐにここに来ると思います。
A2 adjective /sər'praɪzd/

Surprised

驚いた
Meaning
feeling or showing surprise; astonished
Example
I was surprised to see my old friend at the market.
私は市場で古い友達を見て驚きました。
B2 noun (plural) /skræps/

scraps

残り物
Meaning
Small pieces left over from something; also small fights or quarrels.
Example
The dog ate the scraps from the table.
犬はテーブルからの食べ残しを食べました。