Serious
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A2 adjective /ˈsɪr.i.əs/

Serious

Meaning
thoughtful; grave; requiring careful consideration; not joking
Example
This is a serious matter that needs immediate attention.
B2 noun /ˈskɛlɪtən/

skeleton

Meaning
The internal framework of bones that supports the body of a human or animal.
Example
The teacher showed the students a human skeleton in the biology class.
C1 verb /ˈstæɡ.neɪt/

stagnate

Meaning
to stop developing, progressing, or moving
Example
Without innovation, the business will stagnate.
B2 adjective /ˈskeptɪkəl/

Sceptical

Meaning
having doubts; not easily convinced; questioning the truth of something
Example
Many scientists remain sceptical about the new theory.
C1 verb/noun /stuːp/

stoop

Meaning
To bend one's body forward and downward; also a small porch or staircase at the entrance of a house
Example
He had to stoop to pick up the coin.
C1 noun /ˈsɒl.ɪs/

Solace

Meaning
comfort or consolation in a time of distress or sadness
Example
She found solace in music after her loss.
C1 noun ˌsætʃəˈreɪʃən

saturation

Meaning
The state of being saturated; the degree or extent to which something is dissolved or absorbed
Example
The saturation of the market with similar products reduced sales.
C1 noun /speɪt/

spate

Meaning
a large number of things occurring in quick succession
Example
There has been a spate of robberies in the city.
B2 verb /ˈskræmbəl/

scramble

Meaning
to move or climb quickly using hands and feet; to mix or arrange in a hurried way
Example
The kids scrambled up the hill to catch the kite.
B2 noun ˈsʌbstɪˌtut

substitute

Meaning
A person or thing acting or serving in place of another.
Example
Money cannot be a substitute for genuine happiness.
A2 noun, verb, adjective /saʊnd/

sound

Meaning
a sensation perceived by the ear; to make or cause to make a noise; in good condition
Example
The bell sounded across the valley.
C2 noun /ˈstætɪks/

statics

Meaning
The branch of mechanics dealing with bodies at rest and forces in equilibrium.
Example
She is studying statics as part of her engineering course.
B1 noun /ˈsɛtɪŋ/

setting

Meaning
the environment or place where something happens
Example
The setting of the movie was a beautiful beach.
C1 adjective /səˈdʒɛstɪv/

suggestive

Meaning
tending to suggest ideas or images; sometimes implies something sexual or provocative
Example
The painting was highly suggestive and sparked much debate.
B2 adjective /stɪf/

Stiff

Meaning
not easily bent or changed; rigid; firm
Example
The old wooden board was too stiff to bend.
B1 noun sɪˈlek.ʃən

selection

Meaning
The action or fact of carefully choosing someone or something as being the best or most suitable.
Example
The selection process is based on merit.
B2 noun /ˈsʌ.plɪ.mənt/

Supplement

Meaning
something that completes or adds to something else; a dietary product
Example
She takes vitamin supplements to maintain her health.
A2 noun sɔːŋz

songs

Meaning
A short poem or other set of words set to music or meant to be sung.
Example
Listen to songs to learn pronunciation.
C2 noun /ˈsɛm.ɪ.nɛr.i/

seminary

Meaning
A school or college for training priests, ministers, or rabbis.
Example
He decided to enroll in a seminary to study theology.
B2 noun /ˈʃʌtəl/

shuttle

Meaning
a vehicle or craft that travels regularly between two places.
Example
The airport shuttle runs every 30 minutes.
A1 adverb /soʊ/

so

Meaning
to such a degree or extent
Example
She was so happy with the gift.
C2 adjective /ˈsætərˌnaɪn/

saturnine

Meaning
slow and gloomy in mood
Example
His saturnine expression made everyone in the room uncomfortable.
C2 adjective /sʌbˈlɪŋɡwəl/

sublingual

Meaning
situated or applied under the tongue
Example
The doctor prescribed a sublingual tablet for faster absorption.
C2 adverb /ˌsʌb ˈroʊzə/

sub rosa

Meaning
secretly, in confidence, or in private
Example
The deal was made sub rosa to avoid public scrutiny.
C1 noun /sleɪ/

sleigh

Meaning
A vehicle pulled by horses or reindeer over snow or ice.
Example
Children were excited to ride in the sleigh through the snowy village.
C1 noun /strəˈtiː.dʒɪk ˈɪn.saɪts/

strategic insights

Meaning
Deep understanding and wisdom gained through careful analysis for planning purposes.
Example
Strategic insights guide policymaking.
C1 verb /ˈswɪndl/

swindle

Meaning
to cheat someone out of money or possessions by deceit
Example
The con artist tried to swindle the old man out of his savings.
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 /spɜːr/

spur

Meaning
To encourage or motivate someone to take action.
Example
The teacher's praise spurred him to study harder.
C1 noun /səˈlaɪ.və/

Saliva

Meaning
the watery liquid secreted into the mouth by glands
Example
The dentist asked her to rinse the saliva from her mouth.
B2 verb /səˈsteɪn/

sustain

Meaning
To support, maintain, or keep something going over time.
Example
The team worked hard to sustain their success.
A2 noun /siːd/

seed

Meaning
the small, hard part of a plant from which a new plant can grow
Example
I planted a seed in the garden.
C1 noun /stents/

stents

Meaning
Small mesh tubes used to treat narrow or blocked arteries.
Example
Stents were successfully placed using robotic techniques.
C2 noun /ˈsuːθˌseɪər/

soothsayer

Meaning
a person who claims to predict the future
Example
The king consulted a soothsayer before going to war.
B2 adjective /stɑːrk/

stark

Meaning
Severe, sharp, or clearly defined; plain and without any decoration.
Example
The stark contrast between poverty and wealth was evident in the city.
A2 adjective /ˈsɪmələr/

Similar

Meaning
alike; having characteristics in common
Example
The two sisters have similar interests in music.
A2 adjective /sɪk/

Sick

Meaning
unwell; having a disease or illness; feeling nauseous
Example
She stayed home from work because she was feeling sick.
C1 noun /sɪˈdʌk.ʃən/

Seduction

Meaning
the action of seducing someone; temptation to do something wrong
Example
He fell victim to the seduction of easy money.
C1 noun /səˈvænə/

savanna

Meaning
a grassy plain with scattered trees, typical of tropical and subtropical regions
Example
Giraffes browsed on acacia trees across the wide savanna.
B2 verb /ˈstɑːrtl/

startle

Meaning
To surprise or frighten someone suddenly.
Example
The loud noise startled the children.
C1 adjective /səbˈmɪs.ɪv/

Submissive

Meaning
ready to obey others; yielding to authority; humble and compliant
Example
She became submissive after years of harsh treatment.
B1 adjective /spəˈsɪfɪk/

specific

Meaning
Clearly defined or identified; particular; exact.
Example
Make a specific plan to beat procrastination.
B2 adjective /səbˈstæn.ʃəl/

Substantial

Meaning
large in size, amount, or importance; considerable; significant
Example
There was a substantial increase in sales this quarter.
C2 noun /səˈɡæs.ə.t̬i/

sagacity

Meaning
The quality of being sagacious; having or showing keen mental discernment and good judgment.
Example
His sagacity made him a great leader.
B1 noun /ˈskwɪr.əl/

Squirrel

Meaning
a small agile tree-dwelling rodent with a long bushy tail
Example
The squirrel gathered nuts for winter.
B2 verb /skrʌb/

scrub

Meaning
To rub hard so as to clean, typically with a brush and water.
Example
Excessive scrubbing of the eyes is harmful.
C2 adjective /ˈsloʊθfəl/

slothful

Meaning
Lazy, idle, and unwilling to work.
Example
She was too slothful to get out of bed early.
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.
A2 noun /səˈluː.ʃən/

Solution

Meaning
an answer to a problem; a liquid mixture
Example
We need to find a solution to this problem.
A2 verb /stʌk/

stuck

Meaning
unable to move; fixed in one position; unable to continue
Example
The door is stuck and won't open.
C2 noun /ˈsɒfɪzəm/

sophism

Meaning
a clever but misleading argument; fallacious reasoning
Example
The politician's speech was full of sophism designed to mislead voters.
A1 verb /sɔ/

saw

Meaning
to cut with a saw; to use a cutting tool
Example
The carpenter saws the wood into pieces.
B2 noun /spæn/

span

Meaning
the full extent or length of something from one end to another
Example
The bridge has a span of over 500 meters.
C1 adjective /ˈswoʊlən/

swollen

Meaning
Enlarged or puffed up, usually due to injury, inflammation, or fluid accumulation
Example
Her ankle was swollen after she twisted it during the hike.
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 /skɪt/

skit

Meaning
a short, humorous performance or piece of writing
Example
The students performed a funny skit at the event.
C2 noun /ˈsɪkəfənt/

sycophant

Meaning
A person who acts obsequiously toward someone important in order to gain advantage.
Example
The manager was surrounded by sycophants who agreed with everything he said.
C1 noun ˌsɛlf.rɪˈstreɪnt

self-restraint

Meaning
The practice of restraining oneself from indulging in something, typically an impulse or desire.
Example
Practicing self-restraint helps in avoiding impulsive decisions.
C2 adjective /ˌsuː.pər.ɪˈrɑː.ɡə.tɔːr.i/

supererogatory

Meaning
Going beyond what is required or expected; more than necessary.
Example
His donation was supererogatory, far beyond what anyone had asked for.
C2 adjective /ˈseɪpiənt/

sapient

Meaning
Wise, or appearing to be wise.
Example
The professor gave a sapient response to the complex question.
A2 noun /ʃiːp/

sheep

Meaning
a farm animal with thick wool that is raised for its wool, meat, and milk
Example
The farmer keeps a large flock of sheep.
B2 noun /spaɪn/

Spine

Meaning
the backbone or vertebral column of a vertebrate; the central support of a structure
Example
She injured her spine in the accident.
C2 verb /ˌsuːpərɪnˈtɛnd/

superintend

Meaning
to oversee and direct the work or operation of something
Example
She was hired to superintend the construction project.
B2 noun /skoʊp/

scope

Meaning
the range of one's perception, understanding, or activity
Example
The project is beyond the scope of our resources.
B1 verb, adjective /spɛnt/

spent

Meaning
Past tense and past participle of 'spend'; also used as an adjective meaning exhausted or used up.
Example
She spent all her energy preparing for the exam.
B1 noun /sɔɪl/

soil

Meaning
The upper layer of earth in which plants grow.
Example
The soil in this area is reddish.
B2 adjective /steɪl/

Stale

Meaning
no longer fresh; lacking originality or novelty
Example
The bread became stale after sitting out for three days.
C1 adjective /sɛkˈtɛəriən/

sectarian

Meaning
relating to or characterized by the differences between sects, often leading to conflict
Example
The region has been troubled by sectarian violence for decades.
B2 verb ˈsiːlɪŋ

sealing

Meaning
The action of closing or blocking something to prevent entry or escape.
Example
Sealing cracks in the walls can prevent pests from entering.
B1 noun /seɪk/

Sake

Meaning
purpose or reason for doing something; benefit or interest
Example
She worked overtime for the sake of her family's future.
B2 adverb /ˈskɪl.fəl.i/

Skilfully/US: Skillfully

Meaning
in a way that shows ability and training; expertly
Example
She skilfully painted the portrait in just two hours.
A2 noun/verb /sɛns/

sense

Meaning
A faculty by which the body perceives external stimuli; or to perceive something without being told.
Example
She had a strong sense of responsibility.
A2 noun /sænd/

sand

Meaning
Small loose grains of crushed rock, found on beaches and deserts.
Example
Children built castles out of sand on the beach.
B2 noun /swɪŋ/

Swing

Meaning
move or cause to move back and forth or from side to side while suspended or on an axis
Example
The children love to swing in the park.
A2 verb /stɔːr/

store

Meaning
to keep things in a place for future use; to save information
Example
She stores her winter clothes in the attic.
B2 adjective ˈsɑːləm

solemn

Meaning
Formal and dignified; characterized by deep sincerity.
Example
The day begins with a solemn ceremony at the memorial.
B1 adjective ˈʃɔːrt.tɜːrm

short-term

Meaning
Occurring over or involving a relatively short period of time.
Example
Investing in stocks can yield short-term profits.
C1 adjective /ˈspaɪn.ləs/

Spineless

Meaning
lacking courage or determination; weak-willed
Example
He was too spineless to stand up for his beliefs.
B2 noun /ˈskɔːr.pi.ən/

Scorpion

Meaning
a small creature with eight legs, two claws, and a curved tail with a poisonous sting
Example
The scorpion hid under the rock during the day.
C1 verb /sɪndʒ/

singe

Meaning
To burn something superficially or lightly, especially at the edges.
Example
The fire singed his eyebrows.
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 /ˈsɛpərətɪst/

separatist

Meaning
A person who supports the separation of a group from a larger body, often for political or cultural independence.
Example
The separatist group demanded independence from the central government.
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.
B2 noun /səbˈmɪʃən/

submission

Meaning
the act of yielding to authority or presenting something for consideration
Example
Her submission of the report was appreciated by the manager.
B2 noun /ˈspɒt.laɪt/

spotlight

Meaning
a strong beam of light directed onto a particular area; figuratively, public attention
Example
The singer stood proudly in the spotlight.
B2 noun /spaɪs/

spice

Meaning
a substance used to add flavor to food
Example
She added a pinch of spice to the curry for extra flavor.
B2 adjective /ˈspɛʃəˌlaɪzd/

specialized

Meaning
designed or developed for a particular purpose or function
Example
He has a specialized knowledge of ancient civilizations.
C2 verb /ˈsʌli/

sully

Meaning
to damage the purity, integrity, or reputation of something
Example
The scandal sullied the politician’s reputation.
B1 noun /slaɪs/

Slice

Meaning
a thin, flat piece cut from something larger
Example
Would you like a slice of pizza?
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.
B1 verb /ˈsʌfər/

suffer

Meaning
to experience pain, distress, or hardship
Example
She suffered from a severe headache all day.
B2 verb /sɔːr/

soar

Meaning
to fly or rise high in the air; to increase rapidly or dramatically
Example
The eagle soared high above the mountains.
C1 noun /ˌspɒn.təˈneɪ.ɪ.ti/

spontaneity

Meaning
The quality of being spontaneous; natural and unplanned behavior.
Example
His spontaneity makes him a great conversationalist.
B2 noun /ˈswɒl.oʊ/

Swallow

Meaning
a small migratory bird with long wings and a forked tail
Example
The swallow built its nest under the roof.
B2 verb /ˈʃʌfəl/

shuffle

Meaning
to walk by dragging one's feet along or without lifting them fully; to mix or rearrange
Example
He shuffled the cards before dealing them.
B2 verb /slæp/

slap

Meaning
to hit someone quickly with the flat part of the hand; to strike sharply
Example
She was so angry that she slapped him across the face.
C2 noun /seɪn/

seine

Meaning
A large fishing net that hangs vertically in the water.
Example
The fishermen cast their seine into the river.
B2 noun /ˈsɪnˌdroʊm/

syndrome

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.
B1 noun /ˈsoʊ.lər ˌsɪs.təm/

Solar system

Meaning
the sun and all the planets, moons, asteroids and other objects that orbit around it
Example
Our solar system has eight planets orbiting the sun.
B2 noun /ˈsɑːrdʒənt/

sergeant

Meaning
A rank of non-commissioned officer in the armed forces or police.
Example
The sergeant gave orders to the soldiers before the mission.
C2 verb /sleɪk/

slake

Meaning
To satisfy thirst or desire.
Example
She drank cold water to slake her thirst.
C1 adjective /ˈskeɪ.li/

Scaly

Meaning
covered with scales; having a rough surface like scales
Example
The fish has scaly skin.
B2 noun /ˈskɒlərʃɪp/

scholarship

Meaning
an award or grant to support a student's education
Example
She received a scholarship to study abroad.
A2 adverb /ˈsʌm.haʊ/

Somehow

Meaning
in some way; for some reason that is not clear
Example
Somehow, I managed to finish the project on time.
C2 adjective /ˈsæpɪd/

sapid

Meaning
Having a pleasant taste; flavorful.
Example
The chef prepared a sapid dish that delighted everyone at the table.
B2 adjective /sɪˈlek.tɪv/

Selective

Meaning
relating to or involving careful selection; choosy about what to accept
Example
The university has a selective admission process for new students.
B1 noun /ˈsʌn.flaʊər/

Sun flower

Meaning
a large yellow flower that turns to face the sun
Example
The sunflower field looked amazing in the bright sunlight.
B1 verb /spɔɪl/

spoil

Meaning
to damage or ruin something
Example
The rain spoiled the outdoor event.
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 noun /ˈsɛmbləns/

Semblance

Meaning
the outward appearance or apparent form of something, especially when the reality is different
Example
There was only a semblance of order in the chaotic office.
C1 verb /ˈsnɪkər/

snicker

Meaning
to laugh quietly in a disrespectful or mocking way
Example
The students snickered when the teacher made a mistake.
C1 noun /sɪlt/

silt

Meaning
Fine sand, clay, or other material carried by running water and deposited as a sediment.
Example
The river deposited layers of silt along its banks.
C1 verb /ˈspɪərˌhɛd/

spearhead

Meaning
to lead or initiate an action, project, or movement
Example
She spearheaded the campaign for environmental awareness.
C1 adjective /ˈʃɑːdi/

shoddy

Meaning
badly made or done; of poor quality
Example
The contractor did a shoddy job on the repairs.
C2 adjective /ˈsʌmp.tʃuˌɛr.i/

sumptuary

Meaning
Relating to laws or regulations intended to limit personal spending on luxury goods.
Example
In medieval Europe, sumptuary laws restricted the wearing of expensive fabrics to the nobility.
C1 noun /ˌsæbəˈtɜːr/

saboteur

Meaning
A person who engages in sabotage.
Example
The saboteur was arrested before he could plant the bomb.
B1 adjective /sɪnˈsɪər/

Sincere

Meaning
honest and genuine in expressing feelings; free from pretense or deceit
Example
She gave me a sincere apology for her mistake.
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 verb /ˈsætʃəˌreɪt/

saturate

Meaning
to fill completely with something until no more can be absorbed
Example
The heavy rain saturated the ground within minutes.
B2 adjective /səˈbɜːrbən/

suburban

Meaning
relating to or characteristic of a suburb or the people living there
Example
They bought a house in a quiet suburban area.
B2 noun /ˈsɑːrˌkæzəm/

sarcasm

Meaning
The use of irony to mock or convey contempt.
Example
His sarcasm often made people laugh but sometimes offended them.