pentavalent
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C2 adjective /ˌpɛntəˈveɪlənt/

pentavalent

Meaning
Having a valence of five, especially in chemistry.
Example
Phosphorus can exist in a pentavalent state.
C2 verb /əˈɡriːv/

aggrieve

Meaning
to cause distress or make someone feel resentful
Example
She felt aggrieved by the unfair decision.
C2 verb /ˌæd ˈlɪb/

ad-lib

Meaning
to speak or perform without preparation; to improvise
Example
The comedian ad-libbed a joke when the microphone failed.
C2 noun /ˈfaɪəl/

phial

Meaning
a small glass container for liquids, especially medicines
Example
The doctor gave her a phial of medicine.
C2 adjective /ˈpɔːntʃi/

paunchy

Meaning
Having a large or protruding belly.
Example
The paunchy man struggled to button his shirt.
C2 noun /ˈæl.kə.laɪ ækt/

Alkali Act

Meaning
A British law passed in 1863 to regulate the emission of hydrochloric acid gas from alkali works, representing one of the first pieces of environmental legislation.
Example
The Alkali Act of 1863 was one of the first environmental laws.
C2 adjective /ˌɪnɪkˈsprɛsəbl/

inexpressible

Meaning
Too strong or extreme to be expressed in words.
Example
She felt inexpressible joy at the news of her success.
C2 adjective /ˈfjuːzəbl/

fusible

Meaning
Capable of being melted or fused.
Example
The engineer used a fusible alloy in the experiment.
C2 adverb /ˈbruːskli/ or /ˈbrʌskli/

brusquely

Meaning
in a blunt, abrupt, or rude manner
Example
She brusquely dismissed the suggestion.
C2 adjective /ˈvæpɪd/

vapid

Meaning
lacking liveliness, flavor, or interest; dull and uninspired
Example
The lecture was so vapid that half the audience fell asleep.
C2 adjective /ˈpɛstɪlənt/

pestilent

Meaning
Causing or tending to cause death or destruction; harmful or pernicious.
Example
The pestilent atmosphere of the swamp made people sick.
C2 verb /ˈdʒæbər/

jabber

Meaning
To talk quickly and excitedly but with little sense.
Example
The children jabbered happily after the show.
C2 adjective /ˈθrɛdˌbɛr/

threadbare

Meaning
Worn out and thin from too much use; shabby.
Example
His threadbare coat could not keep him warm in winter.
C2 noun /sɪlf/

sylph

Meaning
A mythical spirit of the air; also refers to a slender, graceful woman.
Example
She moved across the stage like a sylph, light and graceful.
C2 noun /ˈmɪsəl/

missal

Meaning
a book containing the texts used in the Catholic Mass throughout the year
Example
The priest read from the missal during the ceremony.
C2 noun/adjective /ˈtraɪkʌlər/

tricolor

Meaning
A flag with three colors; consisting of three colors.
Example
The French tricolor is one of the most famous national flags in the world.
C2 verb /ˌriː.kəˈnɔɪ.tər/

reconnoiter

Meaning
to make a preliminary inspection or survey, especially of an area for military or strategic purposes
Example
The soldiers reconnoitered the area before advancing.
C2 noun /ˈaɪsinəs/

iciness

Meaning
The state of being cold in manner or temperature.
Example
There was a distinct iciness in his voice.
C2 noun /ˈkɔː.seər/

corsair

Meaning
a pirate, especially one operating along the Mediterranean coasts
Example
The corsair plundered ships along the coast.
C2 adjective /trænsˈfjuːzəbl̩/

transfusible

Meaning
capable of being transfused, especially referring to blood or fluids
Example
Only transfusible blood types are used in the hospital.
C2 noun /pɜːrtʃt raɪs/

Perched rice

Meaning
puffed rice; rice that has been heated and puffed into light, crispy grains
Example
I enjoy eating puffed rice as a healthy snack.
C2 adjective /ɔːˈrɪfərəs/

auriferous

Meaning
Containing or producing gold.
Example
The miners discovered an auriferous vein in the mountains.
C2 verb /bɪˈlaɪ/

belie

Meaning
To give a false impression of something; to contradict.
Example
His calm face belied his inner anxiety.
C2 adverb /ˈprɒksɪmətli/

proximately

Meaning
In a near or close manner; nearly.
Example
The village lies proximately to the river.
C2 adjective /ˈfætʃuəs/

fatuous

Meaning
silly or foolish, especially in a self-satisfied way
Example
His fatuous comments during the meeting annoyed everyone.
C2 noun (plural) /ˈlɪniəmənts/

lineaments

Meaning
The features or distinctive characteristics of the face or body.
Example
The lineaments of his face were sharp and stern.
C2 verb, adjective /ˈstraɪeɪt/

striate

Meaning
to mark with stripes or grooves; striped or streaked in appearance
Example
The rock surface was striated by glacial movement.
C2 phrase /lɛt ðɛm ˈθɪə.ri/

let them theory

Meaning
A philosophy of not trying to control others' actions or opinions and allowing them to be themselves.
Example
He follows the Let them theory and ignores negativity.
C2 adjective /ˈtrʌk.jʊ.lənt/

truculent

Meaning
Eager or quick to argue, fight, or show aggression.
Example
She became truculent when her ideas were challenged.
C2 adjective /ˈpɜːrviəs/

pervious

Meaning
Allowing water, air, or other substances to pass through; permeable.
Example
The soil here is pervious to rainwater.
C2 verb /prɪˈværɪkeɪt/

prevaricate

Meaning
to avoid telling the truth by not giving a direct answer
Example
The politician began to prevaricate when asked about the scandal.
C2 noun /ˈkɒkskoʊm/

Cockscomb

Meaning
a tropical plant with bright, velvety flowers that resemble a rooster's comb
Example
The bright red cockscomb flowers added vibrant color to the garden bed.
C2 verb /bɪˈfuːl/

befool

Meaning
to deceive or trick someone into believing something false; to make someone appear foolish
Example
The scammer tried to befool innocent people with fake promises.
C2 adjective /ˌɪrɪˈfrændʒɪbəl/

irrefrangible

Meaning
Not to be broken, violated, or infringed
Example
The constitution guarantees certain irrefrangible rights to every citizen.
C2 verb /ˈɛkspieɪt/

expiate

Meaning
to make amends for guilt or wrongdoing
Example
He tried to expiate his crime by helping the poor.
C2 adjective /ˈfraʊzi/

frowsy

Meaning
Scruffy and neglected in appearance; musty or stale in smell.
Example
He wore a frowsy old jacket that smelled of damp.
C2 adjective /ˈvɪndɪkətɔːri/

vindicatory

Meaning
Serving to justify, clear of blame, or defend.
Example
His vindicatory remarks restored his reputation.
C2 noun /ˈkeɪ.nə.naɪt/

canaanite

Meaning
a member of a people who lived in the ancient land of Canaan in the Middle East
Example
The Canaanites were known for their advanced trade networks.
C2 adjective /ˈreə.rɪ.faɪd/

rarefied

Meaning
Of high moral, intellectual, or cultural value; distant from ordinary life.
Example
He works in the rarefied world of classical music.
C2 adjective /dɪˈkɔːrəs/

decourous

Meaning
characterized by propriety, good taste, and proper manners
Example
She maintained a decourous silence during the ceremony.
C2 verb /voʊˈsɪfəˌreɪt/

vociferate

Meaning
to shout, complain, or argue loudly or vehemently
Example
The protesters vociferated against the unfair law.
C2 noun /hɪˈlærɪti/

hilarity

Meaning
Extreme amusement, especially when expressed by laughter.
Example
The movie caused great hilarity among the audience.
C2 adjective /krɪˈpʌskjʊlər/

crepuscular

Meaning
relating to twilight or active during twilight
Example
Bats are crepuscular animals, most active at dawn and dusk.
C2 noun /prəˈfʌn.dɪ.ti/

profundity

Meaning
Deep insight; great depth of knowledge or thought.
Example
The profundity of his words left a lasting impact.
C2 noun /əkˈsɛʃən/

accession

Meaning
the attainment of a position of rank or power, especially a monarch or president; the formal acceptance of an agreement or treaty
Example
The king's accession to the throne was celebrated with great ceremony.
C2 noun /ɪˈnænɪti/

inanity

Meaning
a nonsensical remark or action; silliness; emptiness
Example
The speech was full of inanities that bored the audience.
C2 adjective /ˈnæti/

natty

Meaning
Neat, stylish, and fashionable in appearance.
Example
He looked very natty in his new suit.
C2 noun /ˈhæknɪ/

hackney

Meaning
a horse kept for ordinary riding or hire; also used for something overused or trite
Example
The old hackney was still pulling the carriage.
C2 verb /ˈoʊɡəl/

ogle

Meaning
To look at someone with obvious sexual interest.
Example
He kept ogling the models on the runway.
C2 verb /ɪˈmeɪʃieɪt/

emaciate

Meaning
To make abnormally thin or weak, usually because of illness or lack of food.
Example
The prisoners were emaciated after months without proper food.
C2 noun /hæɡ/

Hag

Meaning
an ugly old woman, especially a vicious or malicious one; a witch
Example
In the fairy tale, the wicked hag lived alone in a cottage deep in the forest.
C2 noun /ˈsteɪsɪs/ or /ˈstæsɪs/

stasis

Meaning
A state of inactivity or equilibrium; a situation where nothing changes.
Example
The negotiations reached a state of stasis with no progress made.
C2 noun /ˈbræɡərt/

braggart

Meaning
a person who boasts about achievements or possessions
Example
No one liked him because he was such a braggart.
C2 verb /rɪˈkjʊə/

recure

Meaning
to cure again; to remedy a second time
Example
The doctor had to recure the wound after it reopened.
C2 verb /ˈɡʌzəl/

guzzle

Meaning
to drink greedily or excessively
Example
He guzzled three cans of soda in a few minutes.
C2 noun /kəmˈpleɪsəns/

complaisance

Meaning
willingness to please others; courteous compliance
Example
Her complaisance made her popular among her colleagues.
C2 noun ˈɒpjʊləns

opulence

Meaning
Great wealth or luxuriousness.
Example
The opulence of the mansion was evident in its ornate furnishings.
C2 adjective /svelt/

svelte

Meaning
Attractively thin, graceful, and elegant in appearance or movement.
Example
She looked svelte in the elegant black dress.
C2 adjective /ˌɪnɪˈsɛnʃəl/

inessential

Meaning
not necessary or important; not essential
Example
The report removes all inessential details to stay focused.
C2 noun /ˌmɪstɪfɪˈkeɪʃən/

mystification

Meaning
the act of making something unclear or confusing; a state of being puzzled or bewildered
Example
The audience watched in mystification as the magician performed his tricks.
C2 noun /ˈflæt.ər.ər/

Flatterer

Meaning
a person who lavishes praise, often insincerely and in order to gain advantage
Example
The king was surrounded by flatterers who only told him what he wanted to hear.
C2 adjective /ˈflɪpənt/

flippant

Meaning
not showing a serious or respectful attitude
Example
His flippant remarks annoyed the teacher.
C2 noun /ˈræŋ.kər/

rancor

Meaning
A feeling of deep and bitter anger or resentment.
Example
There was a rancor between the two rivals that never faded.
C2 noun /ˈfaɪləm/

phylum

Meaning
a primary category in the biological classification of organisms, above class and below kingdom
Example
Humans belong to the phylum Chordata.
C2 verb /hjuː/

hew

Meaning
To chop or cut something, especially wood or stone, with a tool.
Example
The workers hewed logs to build the cabin.
C2 noun /ˌæpəˈleɪʃən/

appellation

Meaning
a name or title
Example
The city has earned the appellation 'The Big Apple'.
C2 noun /ˈkæbəˌlɪzəm/

cabalism

Meaning
The doctrines, practices, or secretive dealings of a cabal.
Example
The historian wrote extensively about cabalism in the royal court.
C2 adjective /ˈæmbjələˌtɔːri/

ambulatory

Meaning
Relating to or able to walk; relating to outpatient medical care.
Example
The patient is ambulatory and does not require bed rest.
C2 noun/verb /ɡraʊs/

grouse

Meaning
A type of bird; or to complain or grumble persistently.
Example
He always grouses about the long hours at work.
C2 adjective /ˌɒbsəˈlɛsnt/

obsolescent

Meaning
Becoming outdated or on the way to becoming obsolete.
Example
The obsolescent technology could not compete with modern devices.
C2 adjective /ˈsæ.loʊ/

sallow

Meaning
Of an unhealthy yellow or pale brown color, often referring to skin.
Example
His sallow complexion made him look tired and sickly.
C2 noun /baɪt/

bight

Meaning
A bend or curve in a geographical feature, especially a coastline, or a loop in a rope.
Example
The sailors anchored in the calm waters of the bight.
C2 verb /ˈfrɪtər/

fritter

Meaning
To waste time, money, or energy on trivial matters.
Example
He frittered away his savings on unnecessary gadgets.
C2 noun /ˌjuːnɪˈtɛəriən/

unitarian

Meaning
A person who believes that God exists as one entity rather than as a Trinity; a member of a religious denomination that emphasizes individual freedom of belief.
Example
The Unitarian church is known for its inclusive and open-minded approach.
C2 adjective /ˈwiːk niːd/

weak-kneed

Meaning
Lacking determination or courage; easily frightened or yielding.
Example
The leader was criticized for being weak-kneed in the face of opposition.
C2 adjective /ˈmɔːrɪbʌnd/

Moribund

Meaning
near death; dying; in a state of decline or decay
Example
The moribund patient was in critical condition.
C2 noun /mʌsk/

Musk

Meaning
a strong-smelling substance secreted by certain animals, used in perfumes and traditional medicine
Example
The perfume contained natural musk that gave it an exotic fragrance.
C2 noun /ˌɪmpəˈtjuːəsəti/

impetuosity

Meaning
The quality of being rash or impulsive.
Example
His impetuosity often got him into trouble.
C2 noun /ˌɪn.strəˈmɛn.təl.ɪst/

instrumentalist

Meaning
A person who plays a musical instrument.
Example
The instrumentalist played a beautiful solo on the violin.
C2 verb /ˈmɒlɪfaɪ/

mollify

Meaning
To calm or soothe someone's anger or anxiety.
Example
The manager tried to mollify the angry customers with discounts.
C2 noun /ˈlɪniəmənt/

lineament

Meaning
A distinctive feature or characteristic, especially of the face.
Example
Her delicate lineaments revealed her noble birth.
C2 noun ˈtræn.zi.əns

transience

Meaning
The state or fact of lasting only for a short time; impermanence.
Example
The transience of youth makes it more precious.
C2 noun /ˈlænjæp/

lagniappe

Meaning
A small gift or bonus given by a seller to a customer.
Example
The shopkeeper offered a piece of candy as a lagniappe.
C2 adverb /ˌeɪˈmɔːrəli/

amorally

Meaning
In a way that shows no concern about whether behavior is morally right or wrong.
Example
He acted amorally, ignoring the consequences of his actions.
C2 verb /əkˈsiːd/

accede

Meaning
to agree to a request, proposal, or demand; to assume an office or position
Example
The government finally acceded to the demands of the protesters.
C2 noun /ˈhaɪərəˌɡlɪf/

hieroglyph

Meaning
A picture or symbol used in ancient writing systems, especially Egyptian writing.
Example
The walls of the temple were covered in hieroglyphs.
C2 noun /ɪmˈbroʊlioʊ/

imbroglio

Meaning
An extremely confused, complicated, or embarrassing situation.
Example
The political imbroglio lasted for months without resolution.
C2 adjective /ˈæfəbəl/

affable

Meaning
friendly, easy to talk to, and pleasant in manner
Example
He is such an affable host that everyone feels comfortable at his parties.
C2 adjective /ˈtæsɪtɜrn/

taciturn

Meaning
reserved or uncommunicative in speech; saying little
Example
He was a taciturn man who rarely spoke in meetings.
C2 verb /əˈkuːtər/

accouter

Meaning
to equip or outfit, typically with military or ceremonial attire
Example
The soldiers were accoutered in full battle gear.
C2 noun /ˈbɛlˌwɛðər/

bellwether

Meaning
A person or thing that leads or indicates a trend.
Example
The company is seen as a bellwether of the technology industry.
C2 noun /ˈiːən/

eon

Meaning
an indefinitely long period of time; an age
Example
Dinosaurs lived millions of years ago, in a different eon.
C2 noun /ˈfaɪər.brænd/

firebrand

Meaning
a person who is passionate about a cause, often inciting change or action
Example
The activist was a true firebrand, inspiring everyone around him to join the protest.
C2 noun /dɪˈstɛnʃən/

distention

Meaning
The state of being swollen due to internal pressure.
Example
The patient complained of abdominal pain and distention.
C2 noun ˈpɑː.stər.ə.lɪ.zəm

pastoralism

Meaning
A form of animal husbandry where domesticated animals are released onto large vegetated outdoor lands for grazing.
Example
Pastoralism is a traditional way of managing livestock.
C2 verb /bɪˈleɪ/

belay

Meaning
to secure a rope by winding it around an object; to stop or cancel an order (nautical/military use)
Example
The climber asked his partner to belay the rope tightly.
C2 noun /ˈlæŋɡər/

languor

Meaning
A state of tiredness, inertia, or dreamy relaxation.
Example
The hot afternoon filled her with languor.
C2 noun /ˈræbəl/

Rabble

Meaning
a disorderly crowd; the common people regarded as socially inferior
Example
The politician dismissed the protesters as mere rabble.
C2 adjective /ɡlɪb/

glib

Meaning
speaking easily but without sincerity or depth
Example
The politician gave a glib answer to a serious question.
C2 adjective əˈsɪd.ju.əs

assiduous

Meaning
Showing great care and perseverance; diligent and hardworking.
Example
His assiduous efforts led to a successful career.
C2 verb /traɪˈsɛkt/

trisect

Meaning
To divide into three parts.
Example
The teacher asked the students to trisect the line segment.
C2 noun /ˈdrɪvəl/

drivel

Meaning
silly or nonsensical talk
Example
The politician’s speech was full of meaningless drivel.
C2 adjective /ʌkˈsɔːriəs/

uxorious

Meaning
excessively fond of or submissive to one's wife
Example
He was so uxorious that he agreed with everything his wife said.
C2 noun /ˈɑːriə/

aria

Meaning
a solo vocal piece with instrumental accompaniment, typically in an opera
Example
The soprano performed a moving aria during the second act.
C2 noun /ræpˈskæliən/

rapscallion

Meaning
A mischievous or cheeky person; a rascal.
Example
The little rapscallion hid his brother’s shoes as a prank.
C2 adjective /ˈtriːkli/

treacly

Meaning
Excessively sweet or sentimental, like treacle.
Example
The movie was too treacly for my taste.
C2 noun /ˈpɑːrsɪmoʊni/

parsimony

Meaning
extreme unwillingness to spend money or use resources
Example
His parsimony was evident in the way he avoided any unnecessary expenses.
C2 adjective /dɪˈsɛnʃənt/

dissentient

Meaning
Expressing or holding opinions that are opposed to the majority or official view.
Example
Only a few dissentient voices were heard during the debate.
C2 adjective /ˈliːwərd/

leeward

Meaning
On or toward the sheltered side away from the wind.
Example
They built their camp on the leeward side of the hill.
C2 adjective /ˈhʌmdrʌm/

humdrum

Meaning
Lacking excitement or variety; dull and monotonous.
Example
She grew tired of the humdrum routine of office life.
C2 noun /ˈsʌplɪkənt/

supplicant

Meaning
A person who humbly or earnestly asks for something, usually from a person of authority.
Example
The temple was filled with supplicants seeking blessings.
C2 noun /ˈpɜːrvjuː/

purview

Meaning
the scope or range of authority, responsibility, or knowledge
Example
The case does not fall within the purview of this court.
C2 noun /mæŋˈɡoʊ.li.ə/

Mangolia

Meaning
a type of flowering tree with large, fragrant pink or white flowers
Example
The beautiful magnolia tree bloomed in spring with pink flowers.
C2 adjective /ˈlɛtʃ.ər.əs/

lecherous

Meaning
having or showing excessive or offensive sexual desire
Example
The character was portrayed as a lecherous old man.
C2 noun /frɒnd/

frond

Meaning
A large, divided leaf of a fern, palm, or similar plant.
Example
The fern's frond stretched gracefully over the garden path.
C2 verb /lʌɡ/

lug

Meaning
to carry or drag something heavy or cumbersome with effort
Example
He had to lug the suitcase up three flights of stairs.
C2 noun /ˈpæk.ɪ.dɜːrm/

pachyderm

Meaning
a large mammal with thick skin, such as an elephant, rhinoceros, or hippopotamus
Example
The zoo had several pachyderms, including elephants and rhinos.
C2 adjective /ˌser.ɪˈməʊ.ni.əs/

ceremonious

Meaning
marked by formality, politeness, or strict observance of customs
Example
He gave her a ceremonious bow before entering the hall.
C2 verb /ˌdɪskəmˈpoʊz/

discompose

Meaning
To disturb the order or calmness of something or someone.
Example
The unexpected question seemed to discompose her.
C2 adjective /həˈmɑː.lə.ɡəs/

homologous

Meaning
Having the same relation, relative position, or structure, especially due to evolutionary origin.
Example
The wings of bats and the arms of humans are homologous structures.
C2 verb /bɪˈfɒɡ/

befog

Meaning
to confuse or make unclear; to cover with fog or mist
Example
His mind was befogged by exhaustion.