| olden | (adjective) relating to time long past | - |
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| older | (adjective) skilled through long experience | Synonyms: old |
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| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, senior |
| (adjective) used of the older of two persons of the same name especially used to distinguish a father from his son | Synonyms: elder, sr. |
| oldish | (adjective) somewhat elderly | - |
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| oldline | (adjective) long-established | Synonyms: old-line |
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| (adjective) adhering to conservative or reactionary principles | Synonyms: old-line |
| oleaceous | (adjective) of or pertaining to or characteristic of trees or shrubs of the olive family | - |
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| oleaginous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, sebaceous |
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| (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, smarmy, soapy, unctuous |
| oleophilic | (adjective) having a strong affinity for oils rather than water | - |
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| oleophobic | (adjective) lacking affinity for oils | - |
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| olfactive | (adjective) of or relating to olfaction | Synonyms: olfactory |
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| olfactory | (adjective) of or relating to olfaction | Synonyms: olfactive |
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| oligarchic | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchical |
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| oligarchical | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchic |
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| olive | (adjective) of a yellow-green color similar to that of an unripe olive | - |
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| olivelike | (adjective) resembling an olive | Synonyms: olive-like |
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| olympian | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, prodigious, surpassing |
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| (adjective) majestic in manner or bearing; superior to mundane matters | Synonyms: majestic |
| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| omissible | (adjective) capable of being left out | - |
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| omissive | (adjective) characterized by omissions | - |
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| omnibus | (adjective) providing for many things at once | - |
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| omnidirectional | (adjective) not directional | - |
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| omnifarious | (adjective) of all varieties or forms or kinds | - |
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| omnipotent | (adjective) having unlimited power | Synonyms: all-powerful, almighty |
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| omnipresent | (adjective) being present everywhere at once | Synonyms: ubiquitous |
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| omniscient | (adjective) infinitely wise | Synonyms: all-knowing |
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| omnivorous | (adjective) feeding on both plants and animals | - |
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| on | (adjective) in operation or operational | - |
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| (adjective) (of events) planned or scheduled | - |
| oncologic | (adjective) of or relating to or practicing oncology | Synonyms: oncological |
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| oncological | (adjective) of or relating to or practicing oncology | Synonyms: oncologic |
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| oncoming | (adjective) moving toward one | - |
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| one | (adjective) used of a single unit or thing; not two or more | Synonyms: 1, ane, i |
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| (adjective) being a single entity made by combining separate components | - |
| (adjective) (informal) very; used informally as an intensifier | Synonyms: right |
| (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one and only, peerless, unmatchable, unmatched, unrivaled, unrivalled |
| (adjective) indefinite in time or position | - |
| (adjective) of the same kind or quality | - |
| (adjective) having the indivisible character of a unit | Synonyms: unitary |
| oneiric | (adjective) of or relating to or suggestive of dreams | - |
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| onerous | (adjective) not easily borne; wearing | Synonyms: burdensome, taxing |
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| onetime | (adjective) belonging to some prior time | Synonyms: erstwhile, former, old, one-time, quondam, sometime |
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| ongoing | (adjective) currently happening | Synonyms: on-going |
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| online | (adjective) connected to a computer network or accessible by computer | Synonyms: on-line |
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| (adjective) on a regular route of a railroad or bus or airline system | Synonyms: on-line |
| (adjective) being in progress now | Synonyms: on-line |
| only | (adjective) exclusive of anyone or anything else | Synonyms: alone |
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| (adjective) being the only one; single and isolated from others | Synonyms: lone, lonesome, sole, solitary |
| onomastic | (adjective) of or related to onomastics | - |
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| onomatopoeic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeical, onomatopoetic |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoetic |
| onomatopoeical | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoetic |
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| onomatopoetic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoeical |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoeic |
| onshore | (adjective) (of winds) coming from the sea toward the land | Synonyms: inshore, shoreward |
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| (adjective) on the edge of the land | - |
| onside | (adjective) not offside; being within the prescribed area of play | - |
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| onstage | (adjective) situated or taking place on the area of a stage visible to the audience | - |
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| ontogenetic | (adjective) of or relating to the origin and development of individual organisms | - |
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| ontological | (adjective) of or relating to ontology | - |
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| onymous | (adjective) bearing a name | - |
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| oozing | (adjective) leaking out slowly | Synonyms: oozy, seeping |
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| oozy | (adjective) leaking out slowly | Synonyms: oozing, seeping |
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| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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| opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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| opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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| (adjective) hard or impossible to understand | Synonyms: unintelligible |
| open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
| (adjective) affording free passage or access | - |
| (adjective) (set theory) of an interval that contains neither of its endpoints | - |
| (adjective) open and observable; not secret or hidden | Synonyms: overt |
| (adjective) used of mouth or eyes | Synonyms: opened |
| (adjective) ready for business | - |
| (adjective) not having been filled | - |
| (adjective) (of textures) full of small openings or gaps | Synonyms: loose |
| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
| (adjective) not requiring union membership | - |
| (adjective) open to or in view of all | - |
| (adjective) possibly accepting or permitting | Synonyms: capable, subject |
| (adjective) without undue constriction as from e.g. tenseness or inhibition | - |
| (adjective) having no protecting cover or enclosure | - |
| (adjective) affording free passage or view | Synonyms: clear |
| (adjective) with no protection or shield | Synonyms: exposed |
| (adjective) accessible to all | - |
| (adjective) not sealed or having been unsealed | Synonyms: opened |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
| (adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
| opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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| opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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| openhearted | (adjective) freely communicative; candidly straightforward | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
| opening | (adjective) first or beginning | - |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| operable | (adjective) capable of being treated by surgical operation | - |
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| (adjective) usable for a specific purpose | Synonyms: practicable |
| (adjective) fit or ready for use or service | Synonyms: functional, operational, usable, useable |
| operant | (adjective) having influence or producing an effect | - |
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| operatic | (adjective) of or relating to or characteristic of opera | - |
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| operating | (adjective) involved in a kind of operation | - |
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| (adjective) being in effect or operation | Synonyms: in operation, operational |
| operational | (adjective) (military) of or intended for or involved in military operations | - |
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| (adjective) pertaining to a process or series of actions for achieving a result | - |
| (adjective) being in effect or operation | Synonyms: in operation, operating |
| (adjective) fit or ready for use or service | Synonyms: functional, operable, usable, useable |
| operationalist | (adjective) of or relating to or espousing operationalism | - |
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| operative | (adjective) being in force or having or exerting force | - |
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| (adjective) relating to or requiring or amenable to treatment by surgery especially as opposed to medicine | Synonyms: surgical |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: functional, running, working |
| (adjective) effective; producing a desired effect | - |
| operculate | (adjective) having an operculum | Synonyms: operculated |
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| operculated | (adjective) having an operculum | Synonyms: operculate |
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| operose | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome |
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| ophthalmic | (adjective) of or relating to ophthalmology | - |
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| (adjective) of or relating to or resembling the eye | Synonyms: ocular, optic, optical |
| opinionated | (adjective) obstinate in your opinions | Synonyms: opinionative, self-opinionated |
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| opinionative | (adjective) obstinate in your opinions | Synonyms: opinionated, self-opinionated |
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| opisthognathous | (adjective) having receding jaws | - |
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| opponent | (adjective) characterized by active hostility | Synonyms: opposing |
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| opportune | (adjective) suitable or at a time that is suitable or advantageous especially for a particular purpose | - |
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| opportunist | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunistic, timeserving |
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| opportunistic | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunist, timeserving |
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| opposable | (adjective) capable of being placed opposite to something | Synonyms: apposable |
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| opposed | (adjective) being in opposition or having an opponent | - |
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| opposing | (adjective) characterized by active hostility | Synonyms: opponent |
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| opposite | (adjective) of leaves etc; growing in pairs on either side of a stem | Synonyms: paired |
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| (adjective) characterized by opposite extremes; completely opposed | Synonyms: diametric, diametrical, polar |
| (adjective) the other one of a complementary pair | - |
| (adjective) being directly across from each other; facing | - |
| (adjective) altogether different in nature or quality or significance | - |
| (adjective) moving or facing away from each other | - |
| oppositive | (adjective) expressing antithesis or opposition | Synonyms: adversative |
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| oppressed | (adjective) burdened psychologically or mentally | Synonyms: laden |
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| oppressive | (adjective) marked by unjust severity or arbitrary behavior | Synonyms: tyrannical, tyrannous |
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| (adjective) weighing heavily on the senses or spirit | - |
| opprobrious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, ignominious, inglorious, shameful |
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| (adjective) expressing offensive reproach | Synonyms: abusive, scurrilous |
| optative | (adjective) relating to a mood of verbs in some languages | - |
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| (adjective) indicating an option or wish | - |
| optic | (adjective) of or relating to or resembling the eye | Synonyms: ocular, ophthalmic, optical |
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| (adjective) relating to or using sight | Synonyms: ocular, optical, visual |
| optical | (adjective) of or relating to or resembling the eye | Synonyms: ocular, ophthalmic, optic |
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| (adjective) of or relating to or involving light or optics | - |
| (adjective) relating to or using sight | Synonyms: ocular, optic, visual |
| optimal | (adjective) most desirable possible under a restriction expressed or implied | Synonyms: optimum |
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| optimistic | (adjective) expecting the best in this best of all possible worlds | - |
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| (adjective) expecting the best | Synonyms: affirmative |
| optimum | (adjective) most desirable possible under a restriction expressed or implied | Synonyms: optimal |
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| optional | (adjective) possible but not necessary; left to personal choice | - |
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| opulent | (adjective) ostentatiously rich and superior in quality | Synonyms: deluxe, gilded, grand, lush, luxurious, princely, sumptuous |
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| oracular | (adjective) of or relating to an oracle | - |
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| (adjective) resembling an oracle in obscurity of thought | Synonyms: enigmatic |
| (adjective) obscurely prophetic | Synonyms: Delphic |
| oral | (adjective) of or involving the mouth or mouth region or the surface on which the mouth is located | Synonyms: buccal |
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| (adjective) a stage in psychosexual development when the child's interest is concentrated in the mouth; fixation at this stage is said to result in dependence, selfishness, and aggression | - |
| (adjective) of or relating to or affecting or for use in the mouth | - |
| (adjective) using speech rather than writing | Synonyms: unwritten |
| orange | (adjective) of the color between red and yellow; similar to the color of a ripe orange | Synonyms: orangish |
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| orangish | (adjective) of the color between red and yellow; similar to the color of a ripe orange | Synonyms: orange |
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| oratorical | (adjective) characteristic of an orator or oratory | - |
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| orbicular | (adjective) circular or nearly circular | Synonyms: orbiculate |
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| (adjective) having the shape of a sphere or ball | Synonyms: ball-shaped, global, globose, globular, spheric, spherical |
| orbiculate | (adjective) circular or nearly circular | Synonyms: orbicular |
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