| 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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