sonic
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C1 adjective /ˈsɒnɪk/

sonic

Meaning
Relating to or involving sound waves or speed of sound.
Example
The jet created a loud boom when it broke the sonic barrier.
C1 noun /sɪˈnɪləti/

senility

Meaning
The state of being old and showing the weaknesses of age, especially mental decline.
Example
His forgetfulness was attributed to senility.
C1 verb /ˈʃʌdər/

shudder

Meaning
to tremble or shake suddenly, often due to fear, cold, or strong emotion
Example
She shuddered at the thought of walking alone in the dark forest.
C1 adjective /ˈsæv.i/

savvy

Meaning
Having practical knowledge and the ability to make good judgments.
Example
She is a tech-savvy entrepreneur.
C1 adjective /ˈsɛptɪk/

septic

Meaning
Infected with harmful bacteria; relating to or causing infection.
Example
The doctor treated the patient's septic wound immediately.
C1 adjective /sɪər/

Sear

Meaning
withered; dried up; burned or scorched
Example
The sear leaves fell from the trees in autumn.
C1 adjective /ˈstɪltɪd/

stilted

Meaning
Speech or writing that is stiff, unnatural, or overly formal.
Example
His speech sounded stilted and rehearsed.
C1 verb /sɪˈkriːt/

secrete

Meaning
to produce and release a substance from a cell, gland, or organ
Example
The pancreas secretes insulin to regulate blood sugar levels.
C1 adverb /suːˈpɜːb.li/

Superbly

Meaning
in an excellent or outstanding manner
Example
She performed superbly in the dance competition.
C1 noun ˌsɪs.təˈmæt.ɪk ˈstræt.ə.dʒi

systematic strategy

Meaning
A methodical and organized plan or approach to achieve specific objectives.
Example
A systematic strategy was employed to achieve objectives.
C1 adjective /seɪdʒ/

Sage

Meaning
wise; showing wisdom from experience; prudent; having good judgment
Example
The sage advice from the elder helped solve the problem.
C1 noun /ˈsteɪ.ʃən.ər/

Stationer

Meaning
a person who sells paper, pens, pencils, and other office supplies
Example
The stationer recommended the best pens for writing exams.
C1 noun /səˈprɑːnoʊ/

soprano

Meaning
the highest female or boy’s singing voice
Example
She sang beautifully in the soprano range during the concert.
C1 /ʃrɛd/

shred

Meaning
to tear or cut something into small pieces
Example
She shredded the old documents before throwing them away.
C1 adjective /ˈʃɪp.ʃeɪp/

Shipshape

Meaning
neat and tidy; in good order; well-organized
Example
Everything was shipshape before the inspection.
C1 adjective /ˌsækrɪˈfɪʃəl/

sacrificial

Meaning
Relating to or involving sacrifice.
Example
The lamb was used as a sacrificial offering in the ritual.
C1 noun/verb /stæmˈpiːd/

stampede

Meaning
A sudden, uncontrolled rush of people or animals; to cause a mass movement.
Example
The loud noise caused a stampede of the crowd.
C1 adjective /ˈsɪnjuəs/

sinuous

Meaning
Having many curves, bends, or turns; winding.
Example
The hikers followed a sinuous path through the forest.
C1 noun /ˌsəʊ.ʃi.əʊˈek.ə.nɒm.ɪk ˈprɒɡ.res/

socioeconomic progress

Meaning
Advancement in both social and economic conditions of a society or community.
Example
Socioeconomic progress uplifts marginalized communities.
C1 verb /ˌsuːpərɪmˈpoʊz/

superimpose

Meaning
to place one thing on top of another so that both can be seen
Example
The editor superimposed text over the image.
C1 noun ˌsæn.ɪ.taɪˈzeɪ.ʃən

sanitization

Meaning
The process of cleaning and disinfecting to eliminate germs and bacteria.
Example
Regular sanitization keeps appliances germ-free.
C1 noun /sɔːd fɪʃ/

Sword fish

Meaning
A large marine fish with an elongated bill resembling a sword
Example
The swordfish can swim at speeds up to 60 mph.
C1 noun /səbˈmɪtəl/

submittal

Meaning
the act of submitting something, especially a document for consideration or approval
Example
The contractor sent the submittal to the client for approval.
C1 adjective /ˈsɒmbər/

somber

Meaning
Dark or dull in color or tone; gloomy or serious.
Example
The funeral had a somber atmosphere.
C1 noun ˈstræt.ə.sfɪər

stratosphere

Meaning
The layer of the earth's atmosphere above the troposphere, extending to about 50 km above the earth's surface.
Example
The stratosphere provides a unique environment.
C1 adjective /sɪˈkluːdɪd/

secluded

Meaning
Placed apart from other people or things; private and quiet.
Example
They spent their vacation in a secluded beach house.
C1 adjective /ˈspel.baʊnd/

Spellbound

Meaning
completely fascinated and unable to move or think about anything else; enchanted
Example
The children sat spellbound as the magician performed his tricks.
C1 adjective /ˈspɑːrtn/

spartan

Meaning
showing simplicity and lack of luxury; austere
Example
He lived in a spartan room with just a bed and a chair.
C1 adjective /ˈstrɛnjuəs/

strenuous

Meaning
Requiring or using great effort and energy.
Example
Climbing the mountain was a strenuous task.
C1 noun /ˈsaɪd.laɪn dɪˈskʌʃənz/

sideline discussions

Meaning
Informal or secondary conversations that occur outside the main agenda of a formal meeting.
Example
Sideline discussions often lead to agreements.
C1 verb /ʃɪə/

shear

Meaning
to cut the wool off a sheep or to cut something with sharp tools like scissors or shears
Example
The farmer will shear the sheep in the spring.
C1 noun /ˈsteɪl.meɪt/

stalemate

Meaning
A situation in which no progress can be made or no party can win.
Example
Negotiations ended in a stalemate.
C1 adjective /ˈʃeɪp.ləs/

Shapeless

Meaning
having no definite or well-defined shape or form
Example
The fog created a shapeless mass in the distance.
C1 verb /ˈsmoʊldər/

smolder

Meaning
to burn slowly with smoke but no flame; to show suppressed anger or emotion
Example
The fire smoldered for hours before it went out.
C1 noun /ˈspɔɪlˌspɔːrt/

spoilsport

Meaning
A person who ruins other people's enjoyment or fun.
Example
Don't be a spoilsport and let us enjoy the party.
C1 adjective /skəˈlæstɪk/

scholastic

Meaning
Relating to schools, education, or academic learning.
Example
The school organizes scholastic competitions every year.
C1 adjective ˈsɛd(ə)ntəri

sedentary

Meaning
Characterized by much sitting and little physical activity.
Example
A sedentary lifestyle can lead to numerous health problems.
C1 noun /ˈsʌm.ɪt əv ðə ˈfjuː.tʃər/

Summit of the Future

Meaning
A high-level conference focused on addressing future challenges and opportunities.
Example
The Summit of the Future addressed global challenges.
C1 noun /səˈlɛmnɪti/

solemnity

Meaning
the state or quality of being serious and dignified
Example
The ceremony was conducted with great solemnity.
C1 noun /ˈsuːtər/

suitor

Meaning
a man who pursues a relationship with a woman, often with the intent to marry
Example
She had many suitors vying for her attention.
C1 adjective /ˈstɪndʒi/

stingy

Meaning
unwilling to spend or give; miserly
Example
He is too stingy to buy a gift for his friend.
C1 verb /ˈsælvɪdʒ/

salvage

Meaning
To save something from loss, damage, or destruction.
Example
They managed to salvage some goods from the fire.
C1 noun ˌsʌb.sɪ.dɪˈzeɪ.ʃən

subsidization

Meaning
Financial assistance provided by government to make certain goods or services more affordable.
Example
Subsidization of agriculture helps farmers maintain crop production.
C1 verb /ˈsʌkɪŋ/

sucking

Meaning
Drawing in a liquid, air, or other substance through the mouth or a tube by creating a vacuum; also used figuratively for something unpleasant or ineffective
Example
The baby is sucking on a pacifier.
C1 noun /ʃraɪn/

Shrine

Meaning
a holy or sacred place dedicated to a specific deity, ancestor, hero, or saint
Example
Pilgrims visit the shrine to pray for good health.
C1 adjective /ˌsekənd ˈreɪt/

second-rate

Meaning
Of mediocre or inferior quality.
Example
The movie was entertaining but clearly second-rate compared to the original.
C1 verb /swɜːrv/

swerve

Meaning
to change direction suddenly, especially to avoid hitting something
Example
The car swerved to avoid the dog.
C1 adjective /ˈsʌl.ki/

Sulky

Meaning
bad-tempered and sullen; moody
Example
The child became sulky when he couldn't get his favorite toy.
C1 adjective /ˈsæk.rəˌsæŋkt/

sacrosanct

Meaning
Regarded as too important or valuable to be interfered with; sacred.
Example
Freedom of speech is considered sacrosanct in democratic societies.
C1 verb /slaʊtʃ/

slouch

Meaning
To stand, sit, or move in a lazy or awkward way.
Example
He slouched in the chair, looking tired.
C1 verb sɪˈkwɛstər

sequester

Meaning
To isolate or hide away.
Example
The carbon captured by trees can be sequestered for years.
C1 verb /ˈʃɪmər/

shimmer

Meaning
To shine with a soft, wavering light.
Example
The lake shimmered under the moonlight.
C1 verb /ˈskaʊər/

scour

Meaning
to clean or brighten the surface of something by scrubbing; to search thoroughly
Example
She scoured the kitchen until it shone.
C1 adjective /ˈskeɪðɪŋ/

scathing

Meaning
severely critical; harshly scornful
Example
The critic wrote a scathing review of the movie.
C1 noun /slɪt/

Slit

Meaning
a long narrow opening or cut
Example
There was a small slit in the fabric.
C1 adjective /səkˈsɪŋkt/

succinct

Meaning
Briefly and clearly expressed; characterized by clear, precise expression in few words.
Example
His speech was succinct and impactful.
C1 noun /ˈstɛə.rɪ.əʊˌtaɪ.pɪŋ/

stereotyping

Meaning
A widely held but fixed and oversimplified image or idea of a particular type of person or thing.
Example
Stereotyping people based on their race is harmful.
C1 noun /ˈsɪmətri/

symmetry

Meaning
the quality of having balanced proportions or identical parts facing each other
Example
The building’s symmetry impressed the visitors.
C1 noun /sɪˈsɛʃən/

secession

Meaning
The action of formally withdrawing from membership of a federation or body.
Example
The secession of the southern states led to the Civil War.
C1 noun ˈsæŋktɪti

sanctity

Meaning
The state or quality of being holy, sacred, or saintly; ultimate importance.
Example
The sanctity of life should never be compromised.
C1 verb /ˈstrætɪfaɪ/

stratify

Meaning
to arrange or divide into layers, classes, or categories
Example
The researchers plan to stratify the data based on age groups.
C1 noun /ʃeɪl/

shale

Meaning
a fine-grained sedimentary rock that can be split into thin layers
Example
The region is rich in shale and natural gas deposits.
C1 noun /ˈskæf.əld/

Scaffold

Meaning
a temporary structure used by workers to stand on when building or repairing something high; a platform for execution
Example
The workers erected a scaffold to paint the building's exterior.
C1 noun /sɪˈnɒpsɪs/

synopsis

Meaning
a brief summary of the main points of a text, film, or research
Example
The publisher asked the author to submit a one-page synopsis of the novel.
C1 noun speɪst ˌrep.ɪˈtɪʃ.ən

spaced repetition

Meaning
A learning technique that involves reviewing information at increasing intervals to improve long-term retention.
Example
Spaced repetition helps in long-term memory retention.
C1 noun /ˈsiːskeɪp/

seascape

Meaning
A view or painting of the sea.
Example
The artist painted a beautiful seascape at sunset.
C1 noun ˈsɪnədʒi

synergy

Meaning
The interaction or cooperation of two or more organizations, substances, or other agents to produce a combined effect greater than the sum of their separate effects.
Example
The synergy between the two companies led to a successful partnership.
C1 adjective /ˈskrɪptʃərəl/

scriptural

Meaning
Relating to or contained in the scriptures or holy writings.
Example
The priest gave a scriptural reference during the sermon.
C1 adjective /ˈsʌbstəntɪv/

substantive

Meaning
Having a firm basis in reality; important, meaningful, or considerable.
Example
The company made substantive changes to its policy.
C1 noun /ˈsʌnˌdaʊn/

sundown

Meaning
the time in the evening when the sun goes below the horizon
Example
We planned to reach the village before sundown.
C1 adjective /ˈsaɪz.mɪk/

seismic

Meaning
Relating to earthquakes or vibrations of the earth and its crust.
Example
The region is known for its seismic activity.
C1 noun, verb /slɜːr/

slur

Meaning
An insulting remark or suggestion; or to speak indistinctly.
Example
He made a slur against her character.
C1 noun /ˌsɛlfsəˈfɪʃənsi/

Self-sufficiency

Meaning
the ability to supply one's own needs without external assistance; independence
Example
The farm achieved complete self-sufficiency in food production.
C1 verb /ˈseɪ.vər/

savor

Meaning
To enjoy something completely, especially by dwelling on it.
Example
He savored every bite of the delicious cake.
C1 adjective /ˈspeɪʃəl/

spatial

Meaning
relating to space or the position, area, and size of things
Example
The scientist studied the spatial arrangement of stars.
C1 noun /ˈsɪstərhʊd/

sisterhood

Meaning
The relationship between sisters, or a community of women united by shared experiences or goals.
Example
The feminist movement created a strong sense of sisterhood among women.
C1 adjective /ˈskræpi/

scrappy

Meaning
Determined and willing to fight or argue; also messy or disorganized.
Example
Despite being small, he was a scrappy fighter.
C1 adjective /ˈspɛərɪŋ/

sparing

Meaning
Using or giving only a little of something; economical.
Example
She is sparing in her use of words.
C1 noun /ˈsɔːjər/

Sawyer

Meaning
a person who saws wood, especially as an occupation
Example
The skilled sawyer cut the logs into planks.
C1 adjective ˌsʌbˈlɪm.ɪ.nəl

subliminal

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.
C1 adjective /sɪmˈplɪstɪk/

simplistic

Meaning
treating complex issues as if they were much simpler than they really are
Example
His explanation was too simplistic and ignored key details.
C1 adjective /ˌsɛm.iˈæn.ju.əl/

semiannual

Meaning
Occurring twice a year; every six months.
Example
The company holds a semiannual meeting with all employees.
C1 noun səˈsteɪnəbəl ænd kəˈlæbərətɪv əˈproʊtʃ

sustainable and collaborative approach

Meaning
A method of working together that can be maintained over time without depleting resources or causing harm.
Example
A sustainable and collaborative approach is crucial for solving environmental problems.
C1 noun ˈsɒv.rɪn.ti

sovereignty

Meaning
The authority of a state to govern itself or another state; supreme power or authority.
Example
Sovereignty is essential for a nation's identity.
C1 verb /səbˈmɜːrdʒ/

submerge

Meaning
to put under water or cover with liquid
Example
The floodwaters threatened to submerge the village.
C1 verb /sɪft/

sift

Meaning
to separate or sort through carefully, often using a sieve or by examining closely
Example
She sifted the flour before adding it to the cake mixture.
C1 verb /ˈskruː.tɪ.naɪz/

scrutinize

Meaning
Examine or inspect closely and thoroughly.
Example
The scientist scrutinized the data before publishing his findings.
C1 verb /skwɪnt/

squint

Meaning
to look with partly closed eyes
Example
She squinted at the bright sunlight.
C1 adjective /ˈsɜːrpənˌtiːn/

serpentine

Meaning
Having the shape, movement, or qualities of a serpent; winding or twisting.
Example
The road took a serpentine path through the mountains.
C1 noun səˈsteɪ.nə.bəl tekˈnɒl.ə.dʒi

sustainable technology

Meaning
Technology designed to meet present needs without compromising future generations' ability to meet their needs.
Example
Sustainable technology ensures a cleaner future.
C1 adjective səˈsaɪ.ə.təl

societal

Meaning
Relating to society or social relationships.
Example
Societal benefits of space tourism are under debate.
C1 verb /sleɪ/

slay

Meaning
to kill violently; informally, to impress greatly
Example
The hero vowed to slay the dragon.
C1 adjective /stɔːntʃ/

staunch

Meaning
Loyal, committed, and firm in support.
Example
She is a staunch supporter of environmental protection.
C1 noun /səˈnɑːtə/

sonata

Meaning
A musical composition for one or more instruments, typically in several movements.
Example
She performed a beautiful Beethoven sonata on the piano.
C1 noun /ˈsɜːrmən/

sermon

Meaning
A religious discourse delivered by a preacher, often offering moral instruction or spiritual guidance.
Example
The pastor gave a moving sermon about compassion and forgiveness.
C1 adjective /ˈsɛnʃuəl/

sensual

Meaning
Relating to or involving gratification of the senses and physical pleasure.
Example
The painting had a sensual quality that captivated viewers.
C1 noun/adjective /ˈstɜː.lɪŋ/

sterling

Meaning
British money, especially pounds; of excellent quality.
Example
She was praised for her sterling work on the project.
C1 adjective /ˈskrʌmpʃəs/

scrumptious

Meaning
extremely tasty or delicious
Example
She baked a scrumptious chocolate cake for the party.
C1 noun /ˈsɪndɪkət/

syndicate

Meaning
A group of individuals or organizations combined to promote a common interest or carry out a business venture.
Example
A syndicate of investors bought the struggling company.
C1 verb /ˈstriːmlaɪnɪŋ/

streamlining

Meaning
The process of making an organization or system more efficient by simplifying or eliminating unnecessary steps
Example
Streamlining processes can significantly reduce operational costs.
C1 verb /stoʊk/

stoke

Meaning
To add fuel to a fire; to encourage or increase a strong feeling or activity.
Example
The politician’s speech stoked anger among the crowd.
C1 noun /ˈskwɒtər/

squatter

Meaning
a person who unlawfully occupies an uninhabited building or unused land
Example
The police removed the squatters from the abandoned house.
C1 verb /ˈstɪɡmətaɪz/

stigmatize

Meaning
to describe or regard someone as worthy of disgrace or disapproval
Example
People with certain illnesses are often unfairly stigmatized.
C1 noun /skwɔːl/

squall

Meaning
a sudden violent gust of wind, often accompanied by rain, snow, or sleet
Example
A sudden squall caught the sailors off guard.
C1 adjective /ˈstɔːlwərt/

stalwart

Meaning
Loyal, reliable, and hardworking; strongly built or sturdy.
Example
She has always been a stalwart supporter of the community.
C1 noun /ʃɑːrd/

shard

Meaning
a broken piece of glass, metal, or pottery
Example
He cut his finger on a shard of glass.
C1 adjective /ˈsted.fæst/

Steadfast

Meaning
firm in belief, determination, or adherence; unwavering
Example
She remained steadfast in her commitment to helping the poor.
C1 verb /sərˈmaʊnt/

surmount

Meaning
to overcome a difficulty or obstacle
Example
He surmounted all the challenges to achieve his dream.
C1 adjective /ˈstɒdʒi/

stodgy

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.
C1 noun /ˈsed.ɪ.mənt/

Sediment

Meaning
matter that settles to the bottom of a liquid; particles deposited by water or wind
Example
The river carried sediment downstream during the flood.
C1 noun /ˌsæl.jʊˈteɪ.ʃən/

Salutation

Meaning
a greeting; an expression of goodwill
Example
The letter began with a formal salutation.
C1 verb /ˈstaɪmi/

stymie

Meaning
to prevent or hinder the progress of something
Example
The new regulations could stymie small businesses.
C1 adjective /ˈsɒljʊbəl/

soluble

Meaning
able to be dissolved, especially in water
Example
Sugar is soluble in water.
C1 noun /ˈstoʊəˌweɪ/

stowaway

Meaning
A person who hides on a ship, plane, or other vehicle in order to travel secretly without paying.
Example
The crew discovered a stowaway hiding in the cargo hold.
C1 verb /skrɔːl/

scrawl

Meaning
to write or draw something quickly and carelessly, making it hard to read
Example
He scrawled his signature at the bottom of the page.
C1 adjective /ˈsɛreɪtɪd/

serrated

Meaning
Having a notched or saw-toothed edge.
Example
The bread knife had a serrated blade.
C1 verb /skwiːl/

squeal

Meaning
to make a high-pitched cry; to inform on someone
Example
The children squealed with delight when they saw the surprise.
C1 adjective sɪˈmæn.tɪk

semantic

Meaning
Related to meaning in language; concerning the interpretation of words and sentences.
Example
AI models use semantic analysis to understand context.
C1 /skwɒt/

squat

Meaning
to crouch or sit with knees bent and body close to the ground
Example
He squatted down to tie his shoes.
C1 noun/verb /smʌdʒ/

smudge

Meaning
a dirty mark or smear; to make something dirty or unclear by rubbing or touching
Example
She accidentally smudged her lipstick on the napkin.
C1 noun /ˈsteɪtəs kwoʊ/

status quo

Meaning
The existing state of affairs, especially regarding social or political issues.
Example
The government decided to maintain the status quo until further review.