sentinel
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C1 noun /ˈsɛntɪnəl/

sentinel

Meaning
A soldier or guard whose job is to stand and keep watch.
Example
A sentinel stood at the entrance of the camp.
C1 noun /sɪˈkluːʒən/

seclusion

Meaning
The state of being private, away from other people.
Example
She spent the weekend in complete seclusion in her cabin.
C1 adjective /ˌsɛlf ˈraɪtʃəs/

self-righteous

Meaning
Having or showing an attitude of moral superiority; believing one’s own beliefs are the only right ones.
Example
His self-righteous comments made everyone uncomfortable.
C1 adjective /ˌsuːɪˈsaɪdəl/

Suicidal

Meaning
relating to or having thoughts of killing oneself; extremely dangerous or harmful
Example
The reckless driving was suicidal behavior.
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 noun /ˈsɪməli/

simile

Meaning
A figure of speech involving the comparison of one thing with another using 'like' or 'as'.
Example
She used a simile to describe her eyes as bright as stars.
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 /ˈsɛnʃənt/

sentient

Meaning
Able to perceive or feel things.
Example
Humans are sentient beings capable of reasoning.
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 /ˈsnɪkər/

snicker

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

substitution

Meaning
the action of replacing someone or something with another
Example
The substitution of the old system with the new one was difficult.
C1 noun /ˈskaɪ.lɑːrk/

Sky-Lark

Meaning
a small brown bird known for singing while flying high in the sky
Example
The skylark sang beautifully as it soared above the meadow.
C1 noun /ˈsækrɪlɪdʒ/

sacrilege

Meaning
Violation or misuse of what is regarded as sacred.
Example
Stealing from the temple was considered an act of sacrilege.
C1 adjective /ˌsɛlf əbˈzɔːrbd/

self-absorbed

Meaning
Excessively preoccupied with oneself and one’s own thoughts, feelings, or interests.
Example
He was too self-absorbed to notice his friend's distress.
C1 verb /ˈswɛltər/

swelter

Meaning
to suffer from intense heat
Example
We began to swelter in the midday sun.
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.
C1 noun /ˈsɪləbəl/

syllable

Meaning
A unit of pronunciation having one vowel sound, with or without surrounding consonants, forming the whole or part of a word.
Example
The word 'computer' has three syllables.
C1 verb /swɜːrv/

swerve

Meaning
to change direction suddenly, especially to avoid hitting something
Example
The car swerved to avoid the dog.
C1 noun /ˈsɑːri/

Saree

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.
C1 verb /sʌlk/

sulk

Meaning
to be silent and bad-tempered because you are angry or disappointed
Example
She sulked in her room after the argument.
C1 noun /ˈspaɪər/

spire

Meaning
a tall, pointed structure on top of a building, especially a church
Example
The church spire could be seen from miles away.
C1 noun /ˌsɛnsəˈbɪləti/

Sensibility

Meaning
the ability to appreciate and respond to complex emotional or aesthetic influences; sensitivity
Example
Her artistic sensibility made her appreciate fine details in paintings.
C1 noun /ˈsɛdətɪv/

sedative

Meaning
A substance that calms the nerves or induces sleep.
Example
The doctor prescribed a sedative to help the patient sleep.
C1 verb /səbˈsɪst/

subsist

Meaning
To maintain or support oneself, especially at a minimal level.
Example
Many villagers still subsist on fishing and farming.
C1 noun /ˈsmætərɪŋ/

smattering

Meaning
A small amount or superficial knowledge of something.
Example
He has a smattering of Spanish.
C1 adjective /ˌsɛrənˈdɪpɪtəs/

serendipitous

Meaning
Occurring or discovered by chance in a happy or beneficial way.
Example
Their meeting at the café was purely serendipitous.
C1 noun /sɪv/

sieve

Meaning
a utensil with a mesh or perforated bottom, used for straining or sifting
Example
She used a sieve to strain the pasta.
C1 verb /ˈslækən/

slacken

Meaning
to make or become less tight, less active, or slower
Example
The driver slackened his speed as he approached the village.
C1 noun səbˈsɪs.təns

subsistence

Meaning
The action or fact of maintaining or supporting oneself at a minimum level.
Example
Many farmers depend on subsistence agriculture.
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 noun /ˌsæbəˈtɜːr/

saboteur

Meaning
A person who engages in sabotage.
Example
The saboteur was arrested before he could plant the bomb.
C1 noun /spæt/

spat

Meaning
a short, petty quarrel or argument
Example
They had a brief spat about who should do the dishes.
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 /ˈstrætɪfaɪd/

stratified

Meaning
arranged or classified in layers or strata
Example
Society in the past was highly stratified based on class and wealth.
C1 noun /sɪlk klɔːθ/

Silk cloth

Meaning
fabric made from natural fibers produced by silkworms
Example
The bride wore a beautiful dress made of silk cloth.
C1 noun /sərˈveɪər/

surveyor

Meaning
A person who measures and maps land, buildings, or other features.
Example
The surveyor measured the land for construction.
C1 adjective ˌsɪn.əˈdʒɪs.tɪk

synergistic

Meaning
Relating to the interaction of elements that when combined produce a greater effect than the sum of their individual effects.
Example
A synergistic effect occurs when nutrients work together.
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 verb /ˈstaɪmi/

stymie

Meaning
to prevent or hinder the progress of something
Example
The new regulations could stymie small businesses.
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 verb /sɪˈsiːd/

secede

Meaning
To formally withdraw from a political or organizational union.
Example
Several states threatened to secede from the union.
C1 verb /skɒf/

scoff

Meaning
to speak about something in a mocking or dismissive way
Example
He scoffed at the idea of moving abroad.
C1 adjective /ˈsɜːrvɪsəbl/

serviceable

Meaning
fit for use; usable; in working order
Example
The old bicycle is still serviceable despite its age.
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 adjective /spəˈrædɪk/

sporadic

Meaning
Occurring irregularly or in scattered instances rather than continuously.
Example
The region experienced sporadic rain showers throughout the week.
C1 verb /ˈʃɪmər/

shimmer

Meaning
To shine with a soft, wavering light.
Example
The lake shimmered under the moonlight.
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 /sər'pæs.ɪŋ/

Surpassing

Meaning
exceeding; going beyond; outstanding
Example
Her surpassing beauty made everyone stop and stare.
C1 adjective /ˈsliːzi/

sleazy

Meaning
morally low, dirty, or cheap in quality
Example
He avoided the sleazy nightclub downtown.
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 /stɪnt/

stint

Meaning
a period of time spent doing a particular job or activity
Example
She did a short stint as a teacher before moving abroad.
C1 verb /ˈspɪərˌhɛd/

spearhead

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

stigma

Meaning
a mark of shame or disgrace associated with a particular circumstance or quality
Example
There is still a stigma around mental health issues in many societies.
C1 noun /ˌsʌpəˈzɪʃən/

supposition

Meaning
An assumption or belief that something is true without certain proof.
Example
His plan was based on the supposition that the market would recover quickly.
C1 adjective /ʃruːd/

Shrewd

Meaning
having or showing sharp powers of judgment; astute
Example
The shrewd businessman made a profitable deal in the competitive market.
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 noun /ˈsəʊdiəm/

sodium

Meaning
a soft, silver-white chemical element that is highly reactive and found in salt.
Example
Sodium is an essential element for maintaining fluid balance in the body.
C1 noun /ˈstɛnsəl/

stencil

Meaning
A thin sheet of material with a design cut out, used to produce the design on the surface below by applying paint or ink through the cut-out holes.
Example
The artist used a stencil to paint identical stars on the wall.
C1 noun /ˈsæf.aɪər/

Saphire

Meaning
a precious stone that is typically blue in color
Example
The royal crown was adorned with a large sapphire.
C1 verb /snɪər/

sneer

Meaning
to smile or speak in a mocking or contemptuous way
Example
She sneered at his attempt to sing.
C1 noun /ˈsæf.rən/

Saffron

Meaning
a deep yellow-orange color; an expensive spice derived from crocus flowers
Example
The saffron fabric looked beautiful in the sunlight.
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 verb /səbˈstænʃieɪt/

substantiate

Meaning
To provide evidence to support or prove the truth of something.
Example
The lawyer worked to substantiate the claims with solid evidence.
C1 noun /səbˈvɜːrʒən/

subversion

Meaning
the act of trying to destroy or undermine an established system or authority
Example
The government accused the rebels of planning subversion.
C1 verb /ˈstriːm.laɪn/

streamline

Meaning
To make a process simpler and more efficient.
Example
The company aims to streamline production to reduce costs.
C1 adjective /ˈstrɛnjuəs/

strenuous

Meaning
Requiring or using great effort and energy.
Example
Climbing the mountain was a strenuous task.
C1 adjective /ˈsɪnləs/

Sinless

Meaning
free from sin; pure and innocent; without moral fault
Example
The innocent child appeared sinless in her pure white dress.
C1 noun /ˈsɜːrtʃɑːrdʒ/

surcharge

Meaning
an additional charge or payment added to the usual cost
Example
The airline ticket had a fuel surcharge added to it.
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 noun /ˈseɪ.tən/

Satan

Meaning
the chief evil spirit; the Devil in Christian and Islamic belief
Example
According to religious texts, Satan tempts people to sin.
C1 verb /ˈsɛvər/

sever

Meaning
to cut off or separate, especially by cutting; to end a connection or relationship
Example
He had to sever ties with the company after the dispute.
C1 noun /ˈstɔːrhaʊs/

storehouse

Meaning
A place where goods, supplies, or valuables are stored; a repository
Example
The warehouse acted as a storehouse for all the imported goods.
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 /ˈsɔːl.tɪd fɪʃ/

Salted fish

Meaning
fish preserved with salt; dried and salted fish for storage
Example
Salted fish is a traditional way to preserve seafood.
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 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 adjective /ˈskrʌfi/

Scruffy

Meaning
untidy or unkempt in appearance; shabby and worn
Example
The scruffy old dog wandered through the streets looking for food.
C1 verb /ʃraʊd/

shroud

Meaning
to cover or hide; to wrap in cloth
Example
The mountain peak was shrouded in mist.
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 verb /səˈplænt/

supplant

Meaning
To take the place of something or someone, often by force or strategy.
Example
Digital platforms have supplanted traditional newspapers.
C1 noun /ˈskeɪ.biːz/

Scabies

Meaning
a contagious skin disease caused by mites that causes intense itching
Example
The doctor diagnosed him with scabies after examining the rash.
C1 noun /ˌsɛlf əˌfɜːˈmeɪʃən/

self-affirmation

Meaning
The practice of affirming one's own worthiness and value as an individual.
Example
Daily self-affirmation can boost your confidence.
C1 noun /ˈsaɪ.ən/

scion

Meaning
a descendant of a wealthy, aristocratic, or influential family
Example
He is the scion of a wealthy industrialist family.
C1 verb /ˈsɪnɚdʒaɪzd/

synergized

Meaning
Combine in such a way that the total effect is greater than the sum of the individual effects.
Example
The teams were synergized to maximize productivity.
C1 verb /struː/

strew

Meaning
to scatter or spread things untidily over a surface or area
Example
Clothes were strewn across the floor.
C1 verb /ˈstoʊnwɔːl/

stonewall

Meaning
To delay or block progress by refusing to cooperate or answer
Example
The witness tried to stonewall during the investigation.
C1 adjective /ˈskrɔːni/

scrawny

Meaning
very thin and bony, often looking unhealthy
Example
The scrawny boy could barely lift the heavy bag.
C1 adjective /ˌsʌbˈkɒn.ʃəs/

subconscious

Meaning
Of or concerning the part of the mind which one is not fully aware of but which influences actions and feelings.
Example
Fears often come from the subconscious mind.
C1 noun /səˈsteɪnəbl ˈæɡrɪkʌltʃər/

sustainable agriculture

Meaning
Farming practices that meet current food needs while preserving environmental resources and maintaining the ability to produce food for future generations through ecologically sound methods.
Example
Sustainable agriculture practices protect the environment while ensuring food security.
C1 noun /ˌsɛrənˈdɪpɪti/

serendipity

Meaning
The occurrence of events by chance in a happy or beneficial way.
Example
Finding that old photo album was pure serendipity.
C1 adjective /sɔɪld/

soiled

Meaning
dirty or stained; not clean
Example
His clothes were soiled after playing in the mud.
C1 verb /sleɪ/

slay

Meaning
to kill violently; informally, to impress greatly
Example
The hero vowed to slay the dragon.
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 verb /ˈskʌt.əl/

scuttle

Meaning
To run hurriedly with short, quick steps; or to deliberately sink a ship.
Example
The children scuttled back to their seats when the teacher entered.
C1 adjective, verb /sɪˈdeɪt/

sedate

Meaning
calm, quiet, and composed; or to administer a drug to make someone calm or sleep
Example
The nurse sedated the patient before the operation.
C1 adjective /ˈsiː.naɪl/

senile

Meaning
Showing the weaknesses of old age, especially mental decline.
Example
The old man became senile and forgot familiar faces.
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 noun /ˈskep.tɪ.sɪ.zəm/

skepticism

Meaning
A skeptical attitude; doubt as to the truth of something.
Example
His skepticism about new technology often makes him resistant to change.
C1 noun /ˈsɪk.əl/

Sickle

Meaning
a tool with a curved metal blade and short handle used for cutting grain crops
Example
The farmer harvested wheat using a traditional sickle.
C1 noun /ˈskævɪndʒər/

scavenger

Meaning
an animal or person that feeds on dead or discarded material
Example
Vultures are natural scavengers that clean up the environment.
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 adjective /ˈskrʌmpʃəs/

scrumptious

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

sawdust

Meaning
The tiny particles of wood produced by sawing or sanding.
Example
The floor was covered with sawdust from the carpentry work.
C1 noun /ˈstɪklər/

stickler

Meaning
a person who insists on a certain quality or standard of behavior
Example
He is a stickler for punctuality and never tolerates delays.
C1 noun /ˌsɛnsɪtaɪˈzeɪʃən/

sensitization

Meaning
The process of becoming sensitive to a substance, situation, or influence.
Example
The doctor warned about the sensitization caused by repeated exposure to chemicals.
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 noun /sɪˈtɑːr/

Sitar

Meaning
a traditional Indian stringed musical instrument with a long neck and resonating body
Example
The sitar creates beautiful ragas in Indian classical music.
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 adjective /ˈswɛltərɪŋ/

sweltering

Meaning
uncomfortably hot
Example
The sweltering heat made it hard to work.
C1 noun /slæb/

slab

Meaning
a large, thick, flat piece of stone, concrete, or other hard material
Example
The workers laid a concrete slab for the foundation.
C1 adjective /ˈskɔːrnfəl/

Scornful

Meaning
showing contempt or disdain; expressing scorn
Example
She gave him a scornful look when he made the rude comment.
C1 noun /ˌsəʊʃəˈbɪləti/

sociability

Meaning
The quality or state of being sociable; friendliness.
Example
Her sociability made her popular in the office.
C1 adjective ˈsek.tər spəˈsɪf.ɪk

sector-specific

Meaning
Relating to or designed for a particular sector or industry.
Example
Sector-specific policies attract targeted investments.
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 noun ˌskeɪ.ləˈbɪl.ə.ti

scalability

Meaning
The capacity to be changed in size or scale; the ability of a system to handle a growing amount of work.
Example
The new software offers high scalability for large enterprises.
C1 adjective /sɪmˈfɒnɪk/

symphonic

Meaning
relating to or having the character of a symphony or symphony orchestra
Example
The concert featured a symphonic masterpiece.
C1 adjective /ˈsaʊnd.pruːf/

Sound-proof

Meaning
impervious to sound; preventing sound from entering or leaving
Example
The recording studio has sound-proof walls.
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 adjective /ˈspaɪn.ləs/

Spineless

Meaning
lacking courage or determination; weak-willed
Example
He was too spineless to stand up for his beliefs.
C1 adjective /ˈsɜːrvaɪl/ or /ˈsɜːrvəl/

servile

Meaning
having or showing an excessive willingness to serve or please others
Example
His servile attitude annoyed his colleagues.
C1 verb /sɪˈkluːd/

seclude

Meaning
To keep someone away from other people; to isolate.
Example
The monk chose to seclude himself in the mountains.