sidelong
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C2 adjective, adverb /ˈsaɪdlɔːŋ/

sidelong

Meaning
Directed to the side; indirect, furtive, or not straightforward.
Example
She gave him a sidelong glance across the room.
C2 adjective /stɛnˈtɔːriən/

stentorian

Meaning
Extremely loud and powerful in sound.
Example
The teacher’s stentorian voice quieted the noisy classroom.
C2 noun /sɛnˈsɔːrɪəm/

sensorium

Meaning
The part of the brain or mind concerned with the reception and interpretation of sensory stimuli.
Example
The patient’s sensorium was clouded after the accident.
C2 noun /ʃiːt fɪʃ/

Sheat-fish

Meaning
A large freshwater catfish with a broad flat head and long barbels
Example
The sheat-fish is one of the largest freshwater fish in South Asia.
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.
C2 verb /ˈsʌli/

sully

Meaning
to damage the purity, integrity, or reputation of something
Example
The scandal sullied the politician’s reputation.
C2 noun /ˈstrætədʒəm/

stratagem

Meaning
a plan or scheme designed to achieve a particular goal, often by trickery
Example
The general devised a clever stratagem to outwit the enemy.
C2 noun /ˈsɪbəraɪt/

sybarite

Meaning
a person who loves luxury and pleasure
Example
The millionaire was a true sybarite who lived only for comfort and enjoyment.
C2 adjective /ˌsæpəˈneɪʃəs/

saponaceous

Meaning
Soapy or having the qualities of soap.
Example
The plant has saponaceous leaves that produce foam when rubbed in water.
C2 adjective /ˌsuː.pɚˈsɪl.i.əs/

supercilious

Meaning
Behaving or looking as though one thinks one is superior to others; arrogant and disdainful.
Example
She gave him a supercilious smile as if he was beneath her.
C2 adjective /ˈstɪdʒiən/

stygian

Meaning
extremely dark, gloomy, or forbidding
Example
They walked through the stygian cave with torches.
C2 noun /ˌsɒ̃ˈfrwɑː/

sangfroid

Meaning
Composure or coolness under pressure.
Example
She impressed everyone with her sangfroid during the interview.
C2 noun /sɜːrˈsiːs/

surcease

Meaning
a temporary or final ending or stopping of something
Example
The noise finally came to a surcease after midnight.
C2 noun /ˈseɪpiəns/

sapience

Meaning
Wisdom or intelligence.
Example
Her sapience in solving problems earned her the respect of her colleagues.
C2 adjective /ˈskʌr.ɪ.ləs/

scurrilous

Meaning
Using or expressed in coarse, abusive, or slanderous language.
Example
The politician faced criticism for his scurrilous remarks about his opponent.
C2 adjective /spraɪ/

spry

Meaning
active and lively, especially in old age
Example
The spry grandmother surprised everyone with her quick dance steps.
C2 noun ˈsaɪəns ˈdezət

science-desert

Meaning
A region or area lacking in scientific development, research facilities, or educational institutions.
Example
J.C. Bose thrived in a science-desert.
C2 adjective /ˈslʌvənli/

slovenly

Meaning
Untidy or careless in appearance, habits, or work.
Example
His slovenly appearance made a bad impression at the interview.
C2 adjective /sɪər/

sere

Meaning
Dry or withered, especially vegetation.
Example
The sere leaves crumbled under his feet.
C2 verb /ˈsæŋktɪfaɪ/

sanctify

Meaning
to make holy or sacred; to purify
Example
The priest will sanctify the marriage ceremony.
C2 noun /ˈskɜː.vi/

scurvy

Meaning
A disease caused by a deficiency of vitamin C, leading to weakness, gum disease, and bleeding.
Example
Sailors often suffered from scurvy during long sea voyages without fresh fruits.
C2 verb /ˈsʌk.əl/

suckle

Meaning
to feed a baby or young animal with milk from the breast or udder
Example
The mother cat suckled her kittens in the basket.
C2 noun /sfɛˈrɪsɪti/

sphericity

Meaning
The quality or state of being spherical; roundness.
Example
The sphericity of the ball made it roll smoothly on the ground.
C2 adjective /səˈleɪʃəs/

salacious

Meaning
Having or conveying undue or inappropriate sexual interest.
Example
The tabloid published a salacious story about the celebrity.
C2 noun /ˈsɒfɪst/

sophist

Meaning
a person who uses clever but misleading arguments
Example
He was dismissed as a sophist who twisted facts to win debates.
C2 noun /stɒˈkeɪd/

stockade

Meaning
a defensive barrier made of strong posts or timbers, often around a fort or prison
Example
The prisoners were kept inside the wooden stockade.
C2 adjective /ˈslɪpʃɒd/

slipshod

Meaning
done in a careless, sloppy, or untidy way
Example
The project failed due to slipshod planning.
C2 noun /sɪˈnɛrəsɪs/

syneresis

Meaning
The contraction of two adjacent vowels into a single syllable or the separation of liquid from a gel.
Example
The yogurt showed syneresis when liquid separated on top.
C2 adjective /ˈsɛrid/

serried

Meaning
pressed or crowded together, often in rows or ranks
Example
The soldiers stood in serried ranks, ready for inspection.
C2 adjective /ˌsʌb.əˈkwɒt.ɪk/

subaquatic

Meaning
Existing, living, or located under water.
Example
Divers explored the subaquatic cave system filled with rare fish.
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.
C2 noun /ˈʃɑːdənfrɔɪdə/

schadenfreude

Meaning
pleasure derived from another person's misfortune
Example
He felt a sense of schadenfreude when his rival failed.
C2 noun /ˈsɒfɪstri/

sophistry

Meaning
the use of clever but false arguments, often to deceive
Example
The politician's speech was full of sophistry.
C2 adjective /ˈsfɪŋks laɪk/

sphinx-like

Meaning
Mysterious, enigmatic, or difficult to interpret
Example
Her sphinx-like smile made it hard to guess what she was thinking.
C2 adjective /ˈswɔːrði/

swarthy

Meaning
Having a dark complexion or skin tone.
Example
The sailor had a swarthy face from years under the sun.
C2 adjective /ˈʃɑːpwɔːrn/

shopworn

Meaning
worn or faded from being displayed in a shop; no longer fresh or original
Example
The shopworn shoes were sold at a discount.
C2 noun /ˌsɪləbɪˈkeɪʃən/

syllabication

Meaning
The division of words into syllables.
Example
Proper syllabication helps in correct pronunciation.
C2 adjective /ˈsɪmiən/

simian

Meaning
Relating to, resembling, or affecting apes or monkeys.
Example
The scientist studied the simian behavior of the chimpanzees.
C2 adjective /ˈsʌpliənt/

suppliant

Meaning
Humbly or earnestly asking for something, especially from a person in authority.
Example
The suppliant man begged for mercy at the king's feet.
C2 verb /ˈsɪmpər/

simper

Meaning
to smile in a silly, self-conscious, or affected way
Example
She simpered at his compliment, clearly embarrassed.
C2 noun /ˈspɒt.ɪd sneɪk hed/

Spotted snake head

Meaning
a type of freshwater fish with spotted markings and an elongated head resembling a snake
Example
The spotted snake head is a popular fish for aquaculture in South Asia.
C2 noun /ˈsʌfrədʒɪst/

suffragist

Meaning
a person advocating the extension of suffrage, especially to women
Example
The suffragists organized rallies to demand voting rights for women.
C2 noun/verb /sluːs/

sluice

Meaning
A sliding gate for controlling the flow of water; to wash or rinse with water in large quantities.
Example
The workers sluiced the mud off the street after the heavy rain.
C2 noun /ˈsɛpəlkər/

sepulcher

Meaning
A small room or monument, cut in rock or built of stone, in which a dead person is buried.
Example
The ancient king was laid to rest in a grand sepulcher.
C2 noun /ˈstiː.vəˌdɔːr/

stevedore

Meaning
A person employed to load and unload cargo from ships.
Example
The stevedores worked tirelessly to unload the cargo before dawn.
C2 adjective /səˈpʌlkrəl/

sepulchral

Meaning
Relating to a tomb or burial; gloomy, dismal.
Example
The abandoned house had a sepulchral silence about it.
C2 adjective səˈluː.bri.əs

salubrious

Meaning
Health-giving; healthy; promoting health and well-being.
Example
The mountain air is salubrious and refreshing.
C2 adjective /ˈspiːʃəs/

specious

Meaning
Superficially plausible but actually false; misleading in appearance.
Example
The politician’s argument was specious, sounding convincing but lacking real evidence.
C2 adjective ˌsʌr.əpˈtɪʃ.əs

surreptitious

Meaning
Kept secret, especially because it would not be approved of; done stealthily.
Example
She took a surreptitious glance at his notes.
C2 noun /ˈstrɪk.tʃər/

stricture

Meaning
a restriction or limitation; a critical remark
Example
The new law placed a severe stricture on free speech.
C2 adjective /sɪmˈfoʊniəs/

symphonious

Meaning
Harmonious; producing a pleasant sound or agreement of sound.
Example
The choir's voices were symphonious and filled the hall with beauty.
C2 noun /sʌnd raɪs/

Sunned rice

Meaning
Rice that has been dried in the sun; parched rice
Example
The farmers spread the sunned rice on mats to dry completely.
C2 noun /ˈskɪnˌflɪnt/

skinflint

Meaning
a person who spends as little money as possible; a miser
Example
The landlord was such a skinflint that he never repaired anything.
C2 verb /ʃʌk/

shuck

Meaning
To remove the outer covering, such as the husk of corn or shell of shellfish.
Example
She learned how to shuck oysters quickly.
C2 verb /ˈsʌplɪˌkeɪt/

supplicate

Meaning
To ask for something earnestly or humbly, often in a religious context.
Example
The villagers supplicated the gods for rain during the drought.
C2 noun /slaɪt/

sleight

Meaning
Skill or dexterity, especially in performing tricks.
Example
The magician amazed the crowd with his sleight of hand.
C2 adjective /səˈdʒɛstəbəl/

suggestible

Meaning
easily influenced by the suggestions of others
Example
Children are highly suggestible and may believe what they are told.
C2 adjective /ˌsuːprəˈmʌndeɪn/

supramundane

Meaning
beyond the physical or ordinary world; transcendent
Example
The monk spoke of supramundane peace beyond material life.
C2 noun /sʌbˈɔːl.tən/

subaltern

Meaning
A person holding a subordinate position; in the military, a junior officer.
Example
The subaltern was responsible for leading a small platoon of soldiers.
C2 noun /sɪˈkwiːlə/

sequela

Meaning
A condition that is the consequence of a previous disease or injury.
Example
Lung scarring can be a sequela of severe pneumonia.
C2 noun /seɪn/

seine

Meaning
A large fishing net that hangs vertically in the water.
Example
The fishermen cast their seine into the river.
C2 adjective /ˈsiːmi/

seamy

Meaning
Morally degraded, unpleasant, or sordid.
Example
The novel reveals the seamy side of city life.
C2 noun /ˈsɪbɪləns/

sibilance

Meaning
A hissing or hushing sound, especially in speech with 's' or 'sh'.
Example
The poet used sibilance to create a soft, hissing effect in the verse.
C2 noun /ˈspɛndˌθrɪft/

spendthrift

Meaning
A person who spends money extravagantly or wastefully.
Example
The young prince was known as a spendthrift, wasting his fortune on lavish parties.
C2 adjective /ˈspɔːrtɪv/

sportive

Meaning
Playful, lively, or full of fun.
Example
The children were in a sportive mood during the picnic.
C2 verb /ˌsuːpərˈæd/

superadd

Meaning
to add something to what has already been added
Example
The author chose to superadd a new chapter to the revised edition.
C2 noun /sɒl/

sol

Meaning
The fifth note of the sol-fa musical scale (do, re, mi, fa, sol, la, ti); also the Latin word for sun
Example
The choir practiced singing the note sol during rehearsal.
C2 noun /ˈsækrɪsti/

sacristy

Meaning
a room in a church where sacred vessels and vestments are kept
Example
The priest entered the sacristy before the mass began.
C2 noun /ˌsɪŋ.krəˈnɪs.ɪ.ti/

synchronicity

Meaning
The meaningful coincidence of two or more events that are not planned.
Example
The synchronicity of their thoughts amazed everyone.
C2 noun /səˈvɑːnt/

savant

Meaning
a learned person, especially a distinguished scientist or scholar; sometimes used in the phrase ‘savant syndrome’ for someone with exceptional abilities alongside developmental differences
Example
The conference keynote was delivered by a linguistic savant who studies endangered languages.
C2 adjective /səˈlɪsɪtəs/

solicitous

Meaning
showing concern or care for someone's health, happiness, or comfort
Example
She was always solicitous about the well-being of her students.
C2 adjective /ˈsɑːdn/

sodden

Meaning
thoroughly soaked or saturated with liquid
Example
His clothes were sodden after the heavy rain.
C2 noun /səˈlɪsɪˌtuːd/

solicitude

Meaning
Care or concern for someone or something.
Example
His mother showed great solicitude for his safety.
C2 adjective /sɪˈkweɪʃəs/

sequacious

Meaning
Lacking independence of thought; blindly following.
Example
The sequacious students never questioned their teacher's opinions.
C2 noun /ˈsʌbtrəˌhɛnd/

subtrahend

Meaning
a number that is to be subtracted from another number
Example
In the equation 10 - 4, the number 4 is the subtrahend.
C2 noun /ʃiːf/

sheaf

Meaning
a bundle of grain stalks laid lengthwise and tied together after reaping; a bundle of objects tied together
Example
The farmer carried a sheaf of wheat on his shoulder.
C2 noun /sneɪk ɡɔːrd/

Snake gourd

Meaning
a long, curved vegetable that resembles a snake, commonly used in South Asian cuisine
Example
The snake gourd grows in a twisted, serpentine shape in the garden.
C2 noun /ˌsɒ̃ˈfrwɑː/

sang-froid

Meaning
Composure or coolness, especially in difficult situations.
Example
The leader handled the crisis with remarkable sang-froid.
C2 adjective /ˈspaɪnəs/

spinous

Meaning
Having spines or thorn-like projections
Example
The spinous cactus was difficult to handle without gloves.
C2 verb /ʃiːð/

sheathe

Meaning
to put a sword or knife back into its cover
Example
He quickly sheathed his sword after the duel.
C2 noun /ˌspoʊliˈeɪʃən/

spoliation

Meaning
The act of destroying or ruining something, often evidence or property.
Example
The court punished the company for the spoliation of evidence.
C2 noun /ˈslʌɡərd/

sluggard

Meaning
A lazy, sluggish person.
Example
The sluggard refused to get out of bed even at noon.
C2 noun /sɒp/

sop

Meaning
a concession or appeasement to pacify someone; also a piece of bread dipped in liquid
Example
The manager offered a bonus as a sop to the unhappy employees.
C2 verb /skwɛltʃ/

squelch

Meaning
to make a soft sucking sound, such as when walking on mud; to suppress or silence
Example
His boots squelched in the wet ground.
C2 noun /ˈseɪ.ɡoʊ/

Sago

Meaning
starchy foodstuff obtained from the pith of various tropical palm stems
Example
She prepared sago pudding for dessert.
C2 verb /sɛkˈstuːpəl/

sextuple

Meaning
to make or become six times as great or as many
Example
Within two quarters, the campaign sextupled their daily sign-ups.
C2 verb /skʌlk/

skulk

Meaning
to move or hide secretly, often because you are planning something bad or are feeling guilty
Example
He tried to skulk in the shadows to avoid being seen.
C2 verb /ˌsuːpərˈæn.ju.eɪt/

superannuate

Meaning
to retire someone with a pension, usually due to age or long service
Example
The company decided to superannuate its senior employees after thirty years of service.
C2 adjective /ˌsɒpəˈrɪfɪk/

soporific

Meaning
tending to induce drowsiness or sleep; causing sleepiness
Example
The professor's lecture was so soporific that half the class fell asleep.
C2 noun /sɪnˈtɪl.ə/

scintilla

Meaning
A tiny trace or spark of a specified quality or feeling.
Example
There wasn’t a scintilla of doubt in her mind.
C2 verb /ˈsʌn.dər/

sunder

Meaning
To split apart or separate, especially with force.
Example
The war sundered families and friends.
C2 adjective /ˈsiːkwənt/

sequent

Meaning
Following in order or as a result.
Example
The sequent events changed the course of history.
C2 noun /ˈsɪŋkrəˌnɪzəm/

synchronism

Meaning
The simultaneous occurrence of events or actions.
Example
The synchronism of the dancers' movements amazed the audience.
C2 noun /ˈskæb.ərd/

scabbard

Meaning
A sheath for the blade of a sword or dagger, typically made of leather or metal.
Example
The knight drew his sword from the scabbard.
C2 noun /ˈʃɪbəˌlɛθ/

shibboleth

Meaning
A custom, phrase, or belief distinguishing a particular group of people, often used to identify outsiders.
Example
The phrase became a political shibboleth during the campaign.
C2 verb /səˈfjuːz/

suffuse

Meaning
to gradually spread through or over something
Example
A warm glow suffused her face as she smiled.
C2 adjective /ˌsɒfəˈmɒrɪk/

sophomoric

Meaning
showing immaturity and overconfidence, like a sophomore
Example
His sophomoric behavior embarrassed his friends.
C2 adjective /sʌbˈdʒeɪsənt/

subjacent

Meaning
lying immediately beneath; underlying
Example
The geological survey revealed subjacent layers of rock.
C2 verb /ˈstræɡəl/

straggle

Meaning
To move or spread in an irregular, scattered, or untidy way.
Example
The children began to straggle behind on the long hike.
C2 noun /ˈsɛpəlˌtʃər/

Sepulture

Meaning
the act of burying a dead body; burial; a grave or tomb
Example
The ancient king's sepulture was discovered by archaeologists.
C2 noun /spɪˈlʌŋkər/

spelunker

Meaning
A person who explores caves as a hobby.
Example
The spelunker carried ropes and lights into the dark cave.
C2 noun /ˈsɜːrfɪt/

surfeit

Meaning
an excessive amount of something
Example
There was a surfeit of food at the festival.
C2 noun /ˌself əˈbeɪs.mənt/

self-abasement

Meaning
The act of belittling or humiliating oneself.
Example
His constant self-abasement made others uncomfortable.
C2 adjective /saɪˈdɪəriəl/

sidereal

Meaning
Relating to the stars or constellations; measured relative to the stars.
Example
Astronomers use sidereal time to track the positions of stars.
C2 noun /ˈskɔːrpiən fɪʃ/

Scorpion fish

Meaning
a type of fish with venomous spines that belongs to the family Scorpaenidae
Example
The scorpion fish has dangerous spines that can inject venom.
C2 adjective /səˈprɛsəbl̩/

suppressible

Meaning
capable of being restrained, controlled, or prevented
Example
The symptoms of the disease are suppressible with medication.
C2 adjective /ˈsɒmnələnt/

somnolent

Meaning
Sleepy or drowsy; causing a desire to sleep.
Example
The somnolent lecture made half the class fall asleep.
C2 verb /ˈsɪn.tɪ.leɪt/

scintillate

Meaning
to sparkle or shine brightly; to emit flashes of light
Example
The diamond ring scintillated under the bright lights.
C2 adjective /ˌstætʃuˈɛsk/

statuesque

Meaning
Having the grace, beauty, or dignity of a statue; tall and attractively proportioned.
Example
She had a statuesque figure that turned heads wherever she went.
C2 verb /slʌf/ or /sluː/

slough

Meaning
To shed or cast off (like dead skin); also a swampy or muddy area.
Example
The snake sloughed off its old skin.
C2 verb /ˌsuːpərˈhiːt/

superheat

Meaning
to heat a substance beyond its normal boiling point without it becoming vapor
Example
Engineers superheat the steam to increase the efficiency of the turbine.
C2 noun /səbˈmɜːrʒən/

submersion

Meaning
the state of being under water
Example
The submersion of the fields lasted for several days after the heavy rain.
C2 noun /ˈstrɪndʒənsi/

stringency

Meaning
the quality of being strict, precise, or severe
Example
The stringency of the new rules surprised everyone.
C2 adjective /ˌsʌpəzɪˈtɪʃəs/

supposititious

Meaning
Based on assumption rather than fact; not genuine or authentic.
Example
The story turned out to be supposititious, with no evidence to support it.
C2 noun /ˈsælvoʊ/

salvo

Meaning
A simultaneous discharge of guns or release of bombs; a sudden outburst of cheers or applause.
Example
The soldiers fired a salvo to honor the fallen general.
C2 verb /səbˈsjuːm/

subsume

Meaning
To include or absorb something into a larger group or category.
Example
Minor details were subsumed under the main topic.
C2 noun /ˈstrɪplɪŋ/

stripling

Meaning
a young man who is not yet fully grown
Example
The stripling dreamed of becoming a brave knight.
C2 noun/verb /ˈsoʊdʒɜrn/

sojourn

Meaning
A temporary stay at a place; to stay temporarily
Example
She enjoyed a brief sojourn in Paris during the summer.
C2 adjective /ˈsuːpaɪn/

supine

Meaning
Lying on the back, face upward; failing to act due to laziness or weakness.
Example
He lay supine on the grass, staring at the stars.
C2 adjective /ˈsɪbɪlaɪn/

sibylline

Meaning
Prophetic, mysterious, or cryptic in meaning.
Example
The old woman gave a sibylline warning about the future.
C2 noun /ˈsætræp/

satrap

Meaning
a governor of a province in ancient Persia; also used figuratively for a subordinate ruler
Example
The king appointed a satrap to oversee the distant province.