O

OATH
Synonyms : Curse, epithet, imprecation.
Antonyms : Nonfulfilment, non-realisation.
OBEDIENT
Synonyms : Subservient, dutiful, tractable, yielding, complacent, regardful, reverent, submissive, respectful, observent, deferential.
Antonyms : Stubborn, intractable, disobedient, rebellious, arrogant, mutinous, disrespectful, irreverent, obdurate, obstinate, contrary.
OBJECT
Synonyms : Antiquated, outworn, dead, past, discorded, extinct.
Antonyms : Recent, unused, fresh, modern.
Objective
Synonyms : Purpose, target, end, goal, destination, aim, intention.
Antonyms : Aimlessness, neglect, avoidance, biased.
Obligation
Synonyms : Accountability, requirement, responsibility, bond, duty, compulsion.
Antonyms : Enmity, disloyalty, betrayal, treachery.
OBLIGATORY
Synonyms : Unavoidable, needful, imperative, necessary, compulsory.
Antonyms : Willing, voluntary, desired, self-chosen.
Obliging
Synonyms : Accommodating, friendly, courteous, kind, affable, polite, civil, compliant.
Antonyms : Discourteous, unacommodating, rude, unhelpful, sullen, disobliging, surly, inconsiderate.
OBLIVIOUS
Synonyms : Absent-minded, forgetful, inattentive.
Antonyms : Award, observant, attentive.
OBSCURE
Synonyms : Dim, dense, hidden, dusky, muddy, turbid, involved, uninelligible, dark, doubtful, deep, darksome, cloudy, unknown, ordinary, common, dim, vague, uncertain.
Antonyms : Intelligible, lucid, plain, straightforward, trasparent, unadorned, obvious, evident, apparent, distinct, pellucid, famous, bright, distinct, major.
Observe
Synonyms : Recognize, see, come in sight, discover, detect, notice, note, know, perceive, mark, watch.
Antonyms : Fail to see, over look, ignore, disregard.
OBSOLUTE
Synonyms : Obstruction, hurdle, barrier, hardship, difficulty, snag, hindrance, opposition.
Antonyms : Encouragement, co-operation, aid, help, facility.
Obstinate
Synonyms : Dogged, fixed, firm, headstrong, stubborn, unruly, wilful, unyielding, resolute, obdurate, perverse.
Antonyms : Yielding, complacent, docile, undecided, amenable, tractable, submissive, obedient.
Obstruct
Synonyms : Oppose, impede, block, bar, clog, hinder, choke, check, interrupt, disturb, retard, prevent, thwart, barricade.
Antonyms : Encourage, champion, promote, advance, support, further, inspire, excite, forward, help, assist.
OBVIOUS
Synonyms : Evident, visible, distinct, palpable, patent, clear, discernible, perceptible, conspicuous, apparent, plain, manifest, undoubled, unmistakeable.
Antonyms : Masked, veiled, covert, secret, obscure, hidden, concealed, latent, vague, dark, unapparent, inconspicuous.
Occasional
Synonyms : Irregular, casual, incidental, infrequent, rare, uncommon.
Antonyms : Common, usual, frequent, recurring, customary, regular, habitual, everyday, repeated.
Occupation
Synonyms : Business, profession, vocation, employment, work, craft, pursuit, trade, situation.
Antonyms : Inaction, inactivity, divasion.
ODD
Synonyms : Uneven, uninvited, irregular, unique, peculiar, queer, quaint, singular, eccentric, strange.
Antonyms : Match, matching, even, parallel, regular, steady, usual, natural, common, familiar.
Odious
Synonyms : Detestable, repulsive, revolting, unpleasant, disgusting, loathsome, abominable, hateful, forbidding.
Antonyms : Affable, lovely, inviting, attractive, amenable, pleasant, loving.
OFFENCE
Synonyms : Disgrace, discourtesy, crime, insult, attack, fault, sin.
Antonyms : Meekness, modesty, courtesy, defence, politeness, grace.
Offensive
Synonyms : Injurious, irritating, nasty, nefarious, insolent, abusive, annoying, distasteful, impertinent.
Antonyms : Pleasing, attractive, captivating, civil, courteous, agreeable, deferential, delightful, charming.
OFFER
Synonyms : Hold out, proffer, tender, bid, attempt, adduce, extend, present, volunteer.
Antonyms : Withdraw, retain, withhold, alienate, retract, divert.
Old
Synonyms : Obsolete, primitive, antiquated, elderly, ancient, aged, mature, original, worn-out, old-fashioned, antique.
Antonyms : Novel, fresh, modern, young, current, new, fashionable, immature, recent, latest, up-to-date, unused.
OMEN
Synonyms : Augury, premonition, foreboding, portent, sign, presage.
Antonyms : Of late, universal, historical.
OMIT
Synonyms : Miss, neglect, fail, overlook, skip, pass over, exclude, drop, avoid, disregard.
Antonyms : Embody, comprise, regard, select, embody, embrace.
ONEROUS
Synonyms : Troublesome, wearing, oppressive, burdensome, difficult.
Antonyms : Fluent, harmless, comfortable, easy, unburdensome.
OOZE
Synonyms : Drop, drizzle, drip, let fall.
Antonyms : Pour, gush, flow, rush, rain.
Open
Synonyms : Discover, uncover, clear, free, unlock, liberate, reveal, untie, unclose, undo, show.
Antonyms : Cover, conceal, imprison, close, lock, tie, hide, bounded, fastened, locked, narrow, protected, folded.
OPENING
Synonyms : Beginning, start, inauguration, eye, slot, door, skylight, lattice, throat, mouth, inlet, slit, hole, eyelet, orifice, hatch, arcade, window, sucker, vent, outlet.
Antonyms : Closure, opportunity, screen shutter, close, want, purdah, shut off.
OPERATION
Synonyms : Effect, performance, executive, procedure, action, force, influence, agency, result.
Antonyms : Inaction, ineffectiveness, powerlessness, failure, uselessness, inefficiency.
OPINION
Synonyms : Idea, judgement, theory, dogma, tenet, mind, thought, notion, speculation, verdict, counter, obstruct, contravene, check, bar, combat, contract.
Antonyms : Dictation, non-committal, execution, order, aid, silence, abet, befriend, encourage, help, assist, support.
Opponent
Synonyms : Adversary, antagonist, foe, enemy, rival.
Antonyms : Friend, accomplice, associate, confederate, ally, colleague, partner.
Opportune
Synonyms : Auspicious, convenient, fit, happy, timely, favourable, suitable, appropriate.
Antonyms : Unsuitable, ominous, inconvenient, unfavourable, inappropriate, unsuitable, untimely.
OPPORTUNITY
Synonyms : Occasion,turn, chance, expedient.
Antonyms : Lapse, neglect, leave, omission, undone.
Oppressive
Synonyms : Burdensome, despotic, inhuman, heavy, crushing, severe, tyrannical.
Antonyms : Humane, free, fresh, optimistic, cheerful.
OPPOSE
Synonyms : Hinder, combat, counter, contravene, impede, challenge, prevent, resist, bar, contradict, counter.
Antonyms : Abet, encourage, assist, advance, advocate, promote, defend, back, aid, befriend, help, support.
OPTIMIST
Synonyms : Confident, brave, bright, hopeful, cheerful, happy.
Antonyms : Dejected, drooping, disappointment, pessimist, cheerless, hopeless.
Opulence
Synonyms : Plentiful, luxuriant, riches, affluence, abundance, moneyed.
Antonyms : Dearth, lack, want, paucity, poverty, privation.
ORAL
Synonyms : Vocal, verbal, spoken.
Antonyms : Inscribed, written.
Order
Synonyms : Law, direction, decree, instruction, bid, ordainment, commission, command, mandate, regulation, injunction, ordinance, behest, requirement, prohibition.
Antonyms : Leave, liberty, consent, allowance, permit, permission, licence.
ORDERLY
Synonyms : Tidy, trim, uniform, neat, graceful.
Antonyms : Disoderly, untidy, chaotic, messy.
ORDINARY
Synonyms : Common, usual, commonplace, regular, medium, inferior, undistinguished, average, unremarkable, normal, average.
Antonyms : One-in-a-million, uncommon, above the average, abnormally, extraordinary, high, first rate, superior, distinguished, special, prominent, impressive, captivating, novel.
ORGANISATION
Synonyms : Classification, co-ordination, society, systematisation, association, set-up.
Antonyms : Pell-mell, singleness, misarrangement, unit, individual.
ORGANIZE
Synonyms : Arrange, order, sort, classify, marshal.
Antonyms : Muddle, bungle, disorganize, dishevel.
ORIGIN
Synonyms : Cause, foundation, source, beginning, inception, derivation, root.
Antonyms : Issue, sequel, outcome, result, effect.
Original
Synonyms : Genuine, fresh, inventive, new, real, primary, first, primitive, pristine.
Antonyms : Imitative, borrowed, copied, familiar, normal, fake, old, rare, outstanding, significant, unique.
ORNAMENT
Synonyms : Richness, beautification, paint, embellishment, ornamentation, tracery, adornment, polish, decoration, lining.
Antonyms : Unadorned, simplicity, plain.
Orthodox
Synonyms : Conventional, customary, sound, true, old-fashioned, rigid, conservative.
Antonyms : Unconventional, eccentric, unorthodox, liberal, novel, original, radical.
Ostentation
Synonyms : Exhibition, pomp, flourish, parade, boasting, show, pageantry, pretention, showiness, vaunting.
Antonyms : Modesty, unpretentiousness, personality, truthfulness.
OUTBREAK
Synonyms : Tumult, insurrection, commotion, outburst.
Antonyms : Quiet, subsidence, order, peace.
Outrage
Synonyms : Shock, abuse, injury, insult, indignity, affront, offend, maltreat.
Antonyms : Soothe, placate, appease, honour, mildness, regard, tolerance.
Outspoken
Synonyms : Blunt, open, free, candid, unreserved, abrupt, frank, unceremonious.
Antonyms : Gracious, diplomatic, tactful, reserved, judicious, reticent, secretive.
Outstanding
Synonyms : Noticeable, distinctive, distinguishing, supreme, notable, unpaid, unsettled, due, owing, uncollected.
Antonyms : Cheap, common, inferior, settled, paid, poor, ordinary, appropriated.
OVER
Synonyms : Additional, across, besides, above.
Antonyms : Underneath, beneath, under, below.
Overcharge
Synonyms : Burden, over laden, surcharge, oppress, overload, overstate, exaggerate.
Antonyms : Relieve, free, lighten, disburden, help.
Overcome
Synonyms : Beat, vanquish, triumph, subdue, defeat, surmount, crush, overthrow, overpower, rout.
Antonyms : Protect, guard, keep, maintain, restore, defend, uphold, preserve.
Overwhelm
Synonyms : Inundate, drown, overpower, overthrow, defeat, flood, beat, sink, submerge, subdue.
Antonyms : Bore, expect, dull, surrender, shelter.
Overwrought
Synonyms : Overworked, agitated, excited, stirred, overdone.
Antonyms : Calm, laid back, cool, untroubled.