sustainable
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B2 adjective səˈsteɪ.nə.bəl

sustainable

Meaning
Able to be maintained at a certain rate or level; conserving an ecological balance.
Example
Sustainable practices mitigate environmental impact.
C2 noun /ˈstrɪndʒənsi/

stringency

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

slake

Meaning
To satisfy thirst or desire.
Example
She drank cold water to slake her thirst.
B1 noun /stiːl/

steel

Meaning
a strong, hard metal made of iron and carbon
Example
The building was made from steel to ensure its durability.
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.
A2 verb /stʌk/

stuck

Meaning
unable to move; fixed in one position; unable to continue
Example
The door is stuck and won't open.
B2 adjective /self səˈfɪʃənt/

Self-sufficient

Meaning
able to provide for oneself without depending on others
Example
The farm is completely self-sufficient in producing vegetables.
B2 noun /ˈspəʊkspɜːrsən/

spokesperson

Meaning
a person who speaks on behalf of others or an organization
Example
The spokesperson addressed the press conference on behalf of the company.
A2 noun/verb/adjective /ˈsʌbdʒɪkt/ (noun), /səbˈdʒɛkt/ (verb)

subject

Meaning
noun: a topic or theme; verb: to cause to undergo; adjective: dependent or under authority
Example
The teacher introduced a new subject in class.
B1 verb /spaɪ/

spy

Meaning
to secretly collect information about a person, group, or country
Example
He was caught spying on his neighbor through the window.
C1 noun /ˈsɜːrəɡət/

surrogate

Meaning
A substitute, especially a person deputizing for another in a specific role or office.
Example
The surrogate mother gave birth to the child after carrying it for nine months.
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.
B2 adjective /ˌsʌp.lɪˈmen.tər.i/

Supplementary

Meaning
completing or making an addition to something; additional; extra
Example
Students need to buy supplementary books for the course.
C1 adjective /ˈskeɪ.li/

Scaly

Meaning
covered with scales; having a rough surface like scales
Example
The fish has scaly skin.
C1 adjective /ˈseɪ.vər.i/

savory

Meaning
Having a pleasant salty or spicy taste; morally acceptable.
Example
The restaurant serves a variety of savory dishes.
C1 adjective /snaɪd/

snide

Meaning
mocking or insulting in an indirect way
Example
He couldn’t resist making a snide comment about her dress.
C1 verb /səbˈvɜːrt/

subvert

Meaning
to undermine or overthrow an established system, authority, or institution
Example
The rebels tried to subvert the government.
A2 noun /sɔːs/

Sauce

Meaning
a liquid or semi-liquid substance served with food to add moisture and flavor
Example
She added tomato sauce to her pasta.
B1 noun /ˈsɛkrəteri/

secretary

Meaning
a person employed to handle correspondence and manage routine tasks for an individual or organization
Example
The secretary scheduled the meeting for tomorrow.
A2 noun /ˈstjuːdiəʊ/

studio

Meaning
a room where an artist, photographer, musician, or broadcaster works
Example
The singer recorded her new song in the studio.
A2 noun /ˈsiːkrət/

secret

Meaning
something that is kept or meant to be kept unknown or unseen by others
Example
He told me a secret about his childhood.
B2 noun /ˈspɛk.tə.kəl/

spectacle

Meaning
An impressive display or performance for viewers.
Example
The fireworks created a breathtaking spectacle in the night sky.
C1 noun /ˈskɛptɪk/

skeptic

Meaning
A person who doubts or questions accepted beliefs or claims.
Example
The scientist was a skeptic of theories without solid evidence.
B1 noun /slaɪs/

Slice

Meaning
a thin, flat piece cut from something larger
Example
Would you like a slice of pizza?
A2 adjective /smuːð/

Smooth

Meaning
having an even surface; without difficulties; flowing easily
Example
The road was smooth and comfortable to drive on.
A2 adjective /səkˈsɛsfəl/

Successful

Meaning
having achieved a desired aim or result; prosperous
Example
She was successful in her career as a doctor.
A1 adverb /soʊ/

so

Meaning
to such a degree or extent
Example
She was so happy with the gift.
A2 noun /ˈsɒftweə/

software

Meaning
the programs and other operating information used by a computer
Example
He installed the software to enhance the performance of his computer.
B1 noun /ˈswɛtʃɜːrt/

sweatshirt

Meaning
A casual, long-sleeved pullover garment, typically made of cotton or fleece, worn for warmth or comfort.
Example
He wore a grey sweatshirt while jogging in the park.
B2 adjective /ˈsoʊ.vi.ət/

soviet

Meaning
relating to the Soviet Union or its government
Example
The Soviet era saw significant changes in Eastern Europe.
C2 adjective /ˈʃɪft.ləs/

shiftless

Meaning
Lacking ambition or the ability to accomplish anything; lazy and unmotivated.
Example
He was seen as a shiftless young man with no goals.
A2 noun /stres/

stress

Meaning
Physical, mental, or emotional strain or tension.
Example
Excessive stress can lead to health issues.
B2 noun /ˈsiː.krə.si/

Secrecy

Meaning
the practice of keeping something secret; the state of being kept hidden
Example
The project was conducted in complete secrecy.
C1 adjective /ˈstɛr.aɪl/

sterile

Meaning
Free from bacteria or other living microorganisms; incapable of producing offspring.
Example
The surgeon worked in a sterile environment to avoid infection.
B1 verb /stiːl/

steal

Meaning
to take something without permission; to rob
Example
It's wrong to steal from others.
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.
A2 noun /ˈsɛlər/

seller

Meaning
a person who sells something
Example
The seller offered a discount on bulk purchases.
A2 noun /ˈseɪf.ti/

Safety

Meaning
condition of being protected from danger, risk, or injury
Example
The company prioritizes workplace safety above all else.
B1 adjective /sɪɡˈnɪfɪkənt/

significant

Meaning
Sufficiently great or important to be worthy of attention; noteworthy.
Example
Social media has a significant impact on relationships.
B2 noun /sɪɡˈnɪf.ɪ.kəns/

Significance

Meaning
the quality of being worthy of attention; importance
Example
The discovery has great significance for medical research.
C2 noun /ˈsiːkənt/

secant

Meaning
A straight line that intersects a curve at two or more points.
Example
In geometry, a secant cuts the circle at two distinct points.
B1 adverb /ˈsekəndli/

secondly

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.
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 /ˈʃeɪp.ləs/

Shapeless

Meaning
having no definite or well-defined shape or form
Example
The fog created a shapeless mass in the distance.
A2 adjective /ˈsep.ər.ət/

Separate

Meaning
distinct; not connected; individual; apart
Example
Please keep your personal and professional lives separate.
C2 adjective /səˈluːtəˌtɔri/

salutatory

Meaning
Relating to or expressing a greeting or an address, especially at the beginning of a speech.
Example
She delivered a salutatory address at the graduation ceremony.
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.
A2 adjective /ʃaɪ/

Shy

Meaning
nervous or timid in the company of other people
Example
The shy student rarely spoke up in class discussions.
B2 verb /ˈstrɛŋkθən/

strengthen

Meaning
To make or become stronger.
Example
Communication can strengthen bonds between people.
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.
B1 adverb /sɪɡˈnɪfɪkəntli/

significantly

Meaning
in a way that is large or important enough to have an effect
Example
The economy has significantly improved over the last decade.
A2 noun /ˈstrɔːbəri/

Strawberry

Meaning
a small red heart-shaped fruit with tiny seeds on the surface and sweet taste
Example
I love eating fresh strawberries with cream during summer.
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.
B1 adjective /ˈspaɪ.si/

Spicy

Meaning
having a strong, hot flavor from spices; containing spices
Example
This curry is too spicy for me to eat.
C1 verb /skɒf/

scoff

Meaning
to speak about something in a mocking or dismissive way
Example
He scoffed at the idea of moving abroad.
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 (plural, informal) /skædz/

scads

Meaning
A large number or quantity of something (informal).
Example
She has scads of friends in the city.
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.
C2 adjective /sʌbˈdʒeɪsənt/

subjacent

Meaning
lying immediately beneath; underlying
Example
The geological survey revealed subjacent layers of rock.
B2 adjective /swɪft/

swift

Meaning
moving very quickly; happening promptly
Example
The river current was swift after the heavy rain.
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 adjective /ˈsiːmi/

seamy

Meaning
Morally degraded, unpleasant, or sordid.
Example
The novel reveals the seamy side of city life.
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.
A2 adverb /ˈsʌm.weər/

Somewhere

Meaning
in or at some place; in an unspecified location
Example
I left my keys somewhere in the house.
C1 adjective /ˈsʌlən/

sullen

Meaning
bad-tempered and gloomy; silently resentful
Example
She gave him a sullen look and walked away.
C1 adjective /ˈsæv.i/

savvy

Meaning
Having practical knowledge and the ability to make good judgments.
Example
She is a tech-savvy entrepreneur.
C2 noun /sfɪˈrɒmɪtər/

spherometer

Meaning
An instrument used for measuring the curvature of spherical surfaces.
Example
The scientist used a spherometer to measure the lens curvature.
B2 adjective /ˈsoʊloʊ/

solo

Meaning
performed by one person alone; a single performance
Example
She decided to perform a solo dance at the talent show.
B2 adjective /ˈstɪki/

sticky

Meaning
having the quality of adhering or clinging; difficult to remove or deal with
Example
The candy is too sticky to eat with your hands.
C1 verb /ˈspɪərˌhɛd/

spearhead

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

squabble

Meaning
To argue noisily over something small or unimportant.
Example
The children squabbled over the last piece of cake.
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.
B2 noun /ˌsɪm.ɪˈlær.ə.ti/

Similarity

Meaning
the quality or state of being similar; resemblance
Example
There is a striking similarity between the two paintings.
B2 verb /slæʃ/

slash

Meaning
to cut with a sharp blade; to reduce drastically
Example
The company slashed prices to attract more customers.
C2 noun /seɪn/

seine

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

scalpel

Meaning
A small and extremely sharp bladed instrument used for surgery and dissection.
Example
The surgeon carefully used a scalpel to make the first incision.
C1 noun /ˈspɪnstər/

spinster

Meaning
An unmarried woman, often one who is older and considered unlikely to marry
Example
The novel featured a kind-hearted spinster who cared for the village children.
C2 noun /ˈsɛrəf/

seraph

Meaning
An angelic being associated with light and purity, often depicted as a high-ranking angel in Christian theology.
Example
The stained-glass window depicted a seraph with outstretched wings.
C1 adjective səˈsaɪ.ə.təl

societal

Meaning
Relating to society or social relationships.
Example
Societal benefits of space tourism are under debate.
C2 noun /səbˈsɜːviəns/

subservience

Meaning
the condition of being too willing to obey or serve others
Example
His subservience to authority annoyed his colleagues.
B2 verb, noun /stæb/

stab

Meaning
to pierce or wound with a pointed weapon or object
Example
He was stabbed in the back during the altercation.
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 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.
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.
B2 adjective /ˈstɜːrdi/

sturdy

Meaning
strongly and solidly built; not easily weakened
Example
The carpenter made a sturdy wooden table.
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.
A2 noun /ˈspaɪ.dər/

Spider

Meaning
a small creature with eight legs that makes webs to catch insects
Example
The spider caught a fly in its web.
A2 noun /steɪdʒ/

stage

Meaning
a raised platform or area for performances or presentations
Example
The actor stepped onto the stage to deliver his speech.
B1 noun /ˈsɜːvənt/

servant

Meaning
a person who performs duties for others, especially in a household
Example
The servant opened the door for the guests.
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.
B2 noun /streɪn/

Strain

Meaning
pressure or tension; excessive demand on strength or resources
Example
Working long hours put a strain on his health.
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 /ˈstæl.i.ən/

stallion

Meaning
An adult male horse that is not castrated, often used for breeding.
Example
The farm owns a powerful stallion for breeding purposes.
B2 verb /ˈsɪmplɪfaɪ/

simplify

Meaning
to make easier to understand or do; to reduce complexity
Example
The teacher simplified the complex equation for the students.
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.
B2 noun /sɪˈver.ə.ti/

Severity

Meaning
the quality of being extremely serious or harsh; intensity of something bad
Example
The severity of the storm caused widespread damage across the city.
C1 noun /sɪˈkriː.ʃən/

Secretion

Meaning
a process by which substances are produced and discharged from a cell or gland
Example
Insulin secretion is crucial for blood sugar regulation.
A2 noun /ˈʃaʊər/

shower

Meaning
a brief fall of rain or snow or a device for taking a bath or washing oneself
Example
After the workout, I took a quick shower to refresh myself.
B1 noun /ˈsɛt ʌp/

set-up

Meaning
The arrangement or organization of something; a planned structure or scheme
Example
The company presented a new set-up for the office layout.
B2 noun /stæns/

stance

Meaning
a person's attitude, opinion, or position on an issue
Example
The company took a strong stance on environmental protection.
B2 verb səˈsteɪnd

sustained

Meaning
Strengthened and supported; not allowed to weaken or fail.
Example
The proposal was not sustained.
C1 noun /saɪð/

scythe

Meaning
A tool with a long curved blade used for cutting grass or grain.
Example
The farmer sharpened his scythe before harvesting the wheat.
C1 noun səˌfɪs.tɪˈkeɪ.ʃən

sophistication

Meaning
High level of complexity or refinement.
Example
The sophistication of modern AI technology is remarkable.
A2 noun /sməʊk/

smoke

Meaning
A visible suspension of carbon or other particles in air, typically one emitted from a burning substance.
Example
Smoke from vehicles worsens air quality.
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.
B1 adjective /ˈsplendɪd/

Splendid

Meaning
magnificent; excellent; very impressive
Example
The castle looked splendid in the sunset.
A1 verb /send/

send

Meaning
to cause something to go or be taken to a particular destination; to transmit
Example
I will send you an email with the details.
B2 noun, verb /stiːm/

steam

Meaning
the vapor into which water is converted when heated; to emit or treat with steam
Example
The kettle was steaming on the stove.
A2 verb /sɜːrtʃ/

search

Meaning
to look carefully for someone or something; to examine thoroughly
Example
The police searched the house for evidence.
C2 noun /ˈseɪ.ɡoʊ/

Sago

Meaning
starchy foodstuff obtained from the pith of various tropical palm stems
Example
She prepared sago pudding for dessert.
B2 verb /ˈʃɔːrtn/

shorten

Meaning
To make something shorter in length, duration, or extent
Example
She decided to shorten her speech to fit the time limit.
B2 noun /ˈsɪmptəm/

symptom

Meaning
a sign or indication of something, especially of an illness
Example
Fever is a common symptom of the flu.
B2 noun /spæm/

spam

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.
B2 phrase ˈsɛvən ˈhæbɪts

seven habits

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.
C1 noun /səˈbætɪkəl/

sabbatical

Meaning
A period of paid leave granted to a teacher or worker for study or travel, traditionally every seventh year.
Example
She took a sabbatical to research her new book.
C1 adjective /ˈsɪm.jʊ.leɪ.tɪd/

simulated

Meaning
Artificially created to look real but not actually real.
Example
The pilot trained in a simulated flight environment.
C1 verb /smɪr/

smear

Meaning
to spread or apply a substance messily; to damage someone's reputation with false or unfair words
Example
The child smeared paint across the wall.
B2 adverb /ˈsoʊlli/

solely

Meaning
only; not involving anyone or anything else
Example
He is solely responsible for the decision.
B2 adjective /ˈʃæl.oʊ/

Shallow

Meaning
not deep; superficial; lacking depth of knowledge
Example
The shallow water is perfect for children to play.
B2 noun /ˈseɡ.mənt/

Segment

Meaning
each of the parts into which something is divided; a section or portion
Example
The orange was divided into eight segments.