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These are the 19 vocabulary words starting with O from our free 565-word 11 plus vocabulary list, from oath to ostentatious including 5 advanced words of the kind that separates top verbal reasoning scores. Each entry shows the meaning, synonyms, antonyms and an example sentence — the exact skills tested in GL and CEM verbal reasoning, comprehension and cloze questions. You can also download the full list as a free PDF or practise these words with our free vocabulary games.
A solemn promise, often calling upon God or something sacred as witness; a sworn declaration
“Doctors take an oath to do no harm to their patients.”
Synonyms: vow, pledge, promise, word
Antonyms: betrayal, denial, breach
A material thing that can be seen and touched; to express disapproval or opposition to something
“There was a strange object floating in the water.”
Synonyms: thing, item, article, oppose
Antonyms: approve, agree, support
An expression of disapproval or opposition; a reason for disagreeing with something
“The lawyer shouted 'Objection!' when the question was asked.”
Synonyms: protest, opposition, disagreement, complaint
Antonyms: approval, agreement, acceptance
To make someone legally or morally bound to do something; to do something as a favour or kindness
“The contract obliges both parties to meet certain conditions.”
Synonyms: compel, require, accommodate, assist
Antonyms: release, free, refuse
Not clearly expressed or easily understood; not well-known; to make unclear or difficult to see
“The meaning of the ancient text remains obscure to scholars.”
Synonyms: unclear, vague, unknown, hidden
Antonyms: clear, obvious, famous
Stubbornly refusing to change one's opinion or course of action despite good reasons to do so
“The obstinate child refused to eat his vegetables no matter what.”
Synonyms: stubborn, headstrong, wilful, unyielding
Antonyms: flexible, cooperative, compliant
To fill or take up a space, time, or position; to live or be situated in a place; to keep oneself busy
“The new sofa will occupy most of the living room.”
Synonyms: fill, inhabit, reside, engage
Antonyms: vacate, empty, leave
To happen or take place; to exist or be found; to come into the mind suddenly
“Earthquakes frequently occur in this region.”
Synonyms: happen, take place, arise, develop
Antonyms: cease, stop, prevent
A distinctive smell, especially an unpleasant one; a scent or fragrance
“A strange odour was coming from the basement.”
Synonyms: smell, scent, aroma, fragrance
Antonyms: odourless, scentless
To cause someone to feel hurt, upset, or angry; to commit an illegal act
“I'm sorry if my comments offended you in any way.”
Synonyms: upset, insult, hurt, displease
Antonyms: please, delight, compliment
A sign or warning of something that will happen in the future, especially something significant or bad
“The black cat crossing their path was seen as a bad omen.”
Synonyms: sign, portent, warning, indication
A favourable time, situation, or set of circumstances that makes it possible to do something
“The job interview is a great opportunity to showcase your skills.”
Synonyms: chance, occasion, opening, prospect
Antonyms: obstacle, hindrance, barrier
To actively resist or disagree with something; to compete against someone
“Many citizens oppose the new tax increase.”
Synonyms: resist, fight, challenge, contest
Antonyms: support, agree, approve
To keep someone in hardship and subjection by exercising cruel or unjust authority; to cause distress
“The dictator oppressed the citizens for decades.”
Synonyms: persecute, tyrannize, subjugate, suppress
Antonyms: liberate, free, emancipate
A thing that is or may be chosen; the freedom or right to choose between alternatives
“You have several options to choose from on the menu.”
Synonyms: choice, alternative, selection, possibility
Antonyms: necessity, requirement, obligation
A very unpleasant and prolonged experience; a severe trial or difficult test of character
“The hostages described their three-week ordeal in captivity.”
Synonyms: trial, hardship, suffering, tribulation
Antonyms: pleasure, breeze, delight
The point or place where something begins or is created; a person's social background or ancestry
“Scientists are studying the origin of the universe.”
Synonyms: source, beginning, root, genesis
Antonyms: end, conclusion, result
A dental specialist who corrects irregularities of the teeth, especially using braces and other devices
“The orthodontist recommended braces to straighten her teeth.”
Synonyms: dental specialist, teeth straightener, braces specialist
Characterized by pretentious or showy display; designed to impress or attract notice
“His ostentatious display of wealth annoyed his neighbours.”
Synonyms: showy, flashy, pretentious, flamboyant
Antonyms: modest, humble, understated
The interactive word list adds British audio pronunciation, memory tips and progress tracking for every word — and our 6 free vocabulary games turn revision into play.