| orbital | (adjective) of or relating to an orbit | - |
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| (adjective) of or relating to the eye socket | - |
| orbitual | (adjective) describing a circle; moving in a circle | Synonyms: circular, rotary |
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| orchestral | (adjective) relating to or composed for an orchestra | - |
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| orchestrated | (adjective) arranged for performance by an orchestra | - |
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| ordained | (adjective) invested with ministerial or priestly functions | - |
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| (adjective) fixed or established especially by order or command | Synonyms: appointed, decreed, prescribed |
| ordered | (adjective) having a systematic arrangement; especially having elements succeeding in order according to rule | - |
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| (adjective) disposed or placed in a particular kind of order | Synonyms: arranged |
| (adjective) marked by an orderly, logical, and aesthetically consistent relation of parts | Synonyms: coherent, consistent, logical |
| orderly | (adjective) devoid of violence or disruption | - |
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| (adjective) clean or organized | Synonyms: neat |
| ordinal | (adjective) being or denoting a numerical order in a series | - |
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| (adjective) of or relating to a taxonomic order | - |
| ordinary | (adjective) not exceptional in any way especially in quality or ability or size or degree | - |
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| (adjective) lacking special distinction, rank, or status; commonly encountered | Synonyms: average |
| organic | (adjective) involving or affecting physiology or bodily organs | - |
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| (adjective) relating or belonging to the class of chemical compounds having a carbon basis | - |
| (adjective) being or relating to or derived from or having properties characteristic of living organisms | - |
| (adjective) constitutional in the structure of something (especially your physical makeup) | Synonyms: constituent, constitutional, constitutive |
| (adjective) simple and healthful and close to nature | - |
| (adjective) of or relating to foodstuff grown or raised without synthetic fertilizers or pesticides or hormones | - |
| organicistic | (adjective) relating to or tending toward organicism | - |
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| organisational | (adjective) of or relating to an organization | Synonyms: organizational |
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| organised | (adjective) being a member of or formed into a labor union | Synonyms: organized, unionised, unionized |
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| organismal | (adjective) of or relating to or belonging to an organism (considered as a whole) | Synonyms: organismic |
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| organismic | (adjective) of or relating to or belonging to an organism (considered as a whole) | Synonyms: organismal |
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| organizational | (adjective) of or relating to an organization | Synonyms: organisational |
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| organized | (adjective) methodical and efficient in arrangement or function | - |
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| (adjective) formed into a structured or coherent whole, particularly on a large scale | - |
| (adjective) being a member of or formed into a labor union | Synonyms: organised, unionised, unionized |
| orgiastic | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchanalian, bacchic, carousing |
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| (adjective) used of frenzied sexual activity | - |
| oriental | (adjective) denoting or characteristic of countries of the Far East | - |
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| (adjective) denoting or characteristic of countries of Asia; 'oriental civilization' | - |
| orientated | (adjective) adjusted or located in relation to surroundings or circumstances; sometimes used in combination | Synonyms: oriented |
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| orientating | (adjective) positioning with respect to a reference system or determining your bearings physically or intellectually | Synonyms: orienting |
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| oriented | (adjective) adjusted or located in relation to surroundings or circumstances; sometimes used in combination | Synonyms: orientated |
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| orienting | (adjective) positioning with respect to a reference system or determining your bearings physically or intellectually | Synonyms: orientating |
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| original | (adjective) being or productive of something fresh and unusual; or being as first made or thought of | - |
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| (adjective) (of e.g. information) not secondhand or by way of something intermediary | - |
| (adjective) not derived or copied or translated from something else | - |
| (adjective) preceding all others in time or being as first made or performed | - |
| originative | (adjective) having the ability or power to create | Synonyms: creative |
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| (adjective) containing seeds of later development | Synonyms: germinal, seminal |
| ornamental | (adjective) serving an esthetic rather than a useful purpose | Synonyms: cosmetic, decorative |
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| ornate | (adjective) marked by elaborate rhetoric and elaborated with decorative details | Synonyms: flowery |
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| ornery | (adjective) having a difficult and contrary disposition | Synonyms: cantankerous, crotchety |
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| ornithological | (adjective) of or relating to ornithology | - |
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| oropharyngeal | (adjective) of or relating to or located near the oropharynx | - |
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| orotund | (adjective) (of sounds) full and rich | Synonyms: pear-shaped, rotund, round |
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| (adjective) ostentatiously lofty in style | Synonyms: bombastic, declamatory, large, tumid, turgid |
| orphaned | (adjective) deprived of parents by death or desertion | - |
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| orphic | (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mysterious, mystic, mystical, occult, secret |
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| orthodontic | (adjective) of or relating to or involving or practicing orthodontics | - |
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| orthodox | (adjective) adhering to what is commonly accepted | - |
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| orthogonal | (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, impertinent |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: rectangular |
| (adjective) statistically unrelated | - |
| orthographic | (adjective) of or relating to or expressed in orthography | - |
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| orthomolecular | (adjective) designating or relating to a form of treatment of mental disorders that seeks to restore biochemical balance in the body with large doses of vitamins and minerals | - |
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| orthopaedic | (adjective) of or relating to orthopedics | Synonyms: orthopedic, orthopedical |
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| orthopedic | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedical |
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| orthopedical | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedic |
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| orthoptic | (adjective) of or relating to normal binocular vision | - |
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| orthostatic | (adjective) pertaining to an upright standing posture | - |
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| orthotropous | (adjective) (of a plant ovule) completely straight with the micropyle at the apex | - |
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| oscillating | (adjective) having periodic vibrations | Synonyms: oscillatory |
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| oscillatory | (adjective) having periodic vibrations | Synonyms: oscillating |
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| oscine | (adjective) of or relating to the songbirds | - |
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| oscitant | (adjective) showing lack of attention or boredom | Synonyms: drowsy, yawning |
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| osmotic | (adjective) of or relating to osmosis | - |
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| osseous | (adjective) composed of or containing bone | Synonyms: bony, osteal |
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| ossicular | (adjective) pertaining to the ossicles in the middle ear | Synonyms: ossiculate |
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| ossiculate | (adjective) pertaining to the ossicles in the middle ear | Synonyms: ossicular |
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| ossiferous | (adjective) containing bones (especially fossil bones) | - |
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| ossified | (adjective) set in a rigidly conventional pattern of behavior, habits, or beliefs | Synonyms: fossilised, fossilized |
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| osteal | (adjective) composed of or containing bone | Synonyms: bony, osseous |
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| (adjective) relating to bone or to the skeleton | - |
| ostensible | (adjective) represented or appearing as such; pretended | Synonyms: ostensive |
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| (adjective) appearing as such but not necessarily so | Synonyms: apparent, seeming |
| ostensive | (adjective) represented or appearing as such; pretended | Synonyms: ostensible |
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| (adjective) manifestly demonstrative | - |
| ostentatious | (adjective) intended to attract notice and impress others | Synonyms: pretentious |
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| (adjective) (of a display) tawdry or vulgar | Synonyms: pretentious |
| otc | (adjective) (of securities) not traded on a stock exchange | Synonyms: over-the-counter |
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| other | (adjective) not the same one or ones already mentioned or implied; quantifier, other | - |
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| (adjective) recently past | - |
| (adjective) very unusual; different in character or quality from the normal or expected | - |
| (adjective) belonging to the distant past | Synonyms: early, former |
| otherwise | (adjective) other than as supposed or expected | - |
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| otherworldly | (adjective) existing outside of or not in accordance with nature | Synonyms: nonnatural, preternatural, transcendental |
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| otic | (adjective) of or relating to near the ear | Synonyms: auricular |
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| otiose | (adjective) disinclined to work or exertion | Synonyms: faineant, indolent, lazy, slothful, work-shy |
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| (adjective) producing no result or effect | Synonyms: futile, ineffectual, meaningless, unavailing |
| (adjective) serving no useful purpose; having no excuse for being | Synonyms: pointless, purposeless, senseless, superfluous, wasted |
| ototoxic | (adjective) toxic to the organs of hearing or balance or to the auditory nerve | - |
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| out | (adjective) not allowed to continue to bat or run | - |
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| (adjective) being out or having grown cold | Synonyms: extinct |
| (adjective) outside or external | - |
| (adjective) excluded from use or mention | Synonyms: forbidden, prohibited, proscribed, taboo, tabu, verboten |
| (adjective) not worth considering as a possibility | - |
| (adjective) outer or outlying | - |
| (adjective) directed outward or serving to direct something outward | - |
| (adjective) knocked unconscious by a heavy blow | Synonyms: kayoed, knocked out, KO'd, stunned |
| (adjective) no longer fashionable | - |
| (adjective) out of power; especially having been unsuccessful in an election | - |
| outback | (adjective) inaccessible and sparsely populated | Synonyms: remote |
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| outboard | (adjective) located away from the midline of a vessel or aircraft | - |
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| outbound | (adjective) that is going out or leaving | Synonyms: departing, outward-bound, outward |
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| outbred | (adjective) bred of parents not closely related; having parents of different classes or tribes | - |
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| outcast | (adjective) excluded from a society | Synonyms: friendless |
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| outcaste | (adjective) not belonging to or having been expelled from a caste and thus having no place or status in society | Synonyms: casteless |
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| outclassed | (adjective) decisively surpassed by something else so as to appear to be of a lower class | - |
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| outdated | (adjective) old; no longer valid or fashionable | Synonyms: obsolete, out-of-date, superannuated |
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| outdoor | (adjective) located, suited for, or taking place in the open air | Synonyms: out-of-door, outside |
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| (adjective) pertaining to or concerning the outdoors or outdoor activities | - |
| outdoorsy | (adjective) characteristic of or suitable to outdoor life | - |
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| outer | (adjective) being on the outside or further from a center | - |
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| (adjective) being on or toward the outside of the body | - |
| (adjective) located outside | - |
| outermost | (adjective) situated at the farthest possible point from a center | Synonyms: outmost |
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| outfitted | (adjective) equipped with appropriate wearing apparel and accessories | - |
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| (adjective) furnished with essential equipment for a particular occupation or undertaking occupation | Synonyms: fitted out |
| outflowing | (adjective) that is flowing outward | Synonyms: effluent |
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| outgoing | (adjective) leaving a place or a position | - |
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| (adjective) retiring from a position or office | - |
| (adjective) at ease in talking to others | Synonyms: extroverted, forthcoming |
| outlandish | (adjective) conspicuously or grossly unconventional or unusual | Synonyms: bizarre, eccentric, flakey, flaky, freakish, freaky, gonzo, off-the-wall, outre |
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| outlaw | (adjective) contrary to or forbidden by law | Synonyms: illegitimate, illicit, outlawed, unlawful |
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| (adjective) disobedient to or defiant of law | Synonyms: lawless |
| outlawed | (adjective) contrary to or forbidden by law | Synonyms: illegitimate, illicit, outlaw, unlawful |
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| outlined | (adjective) showing clearly the outline or profile or boundary | Synonyms: defined |
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| outlying | (adjective) relatively far from a center or middle | - |
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| outmoded | (adjective) out of fashion | Synonyms: antique, demode, ex, old-fashioned, old-hat, passe, passee |
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| outmost | (adjective) situated at the farthest possible point from a center | Synonyms: outermost |
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| outraged | (adjective) angered at something unjust or wrong | Synonyms: incensed, indignant, umbrageous |
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| outrageous | (adjective) greatly exceeding bounds of reason or moderation | Synonyms: exorbitant, extortionate, steep, unconscionable, usurious |
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| (adjective) grossly offensive to decency or morality; causing horror | Synonyms: hideous, horrid, horrific |
| outre | (adjective) conspicuously or grossly unconventional or unusual | Synonyms: bizarre, eccentric, flakey, flaky, freakish, freaky, gonzo, off-the-wall, outlandish |
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| outrigged | (adjective) rigged with a structure projecting from or over the side of a boat for various purposes; to prevent capsizing or to support an oarlock or to help secure a mast etc | - |
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| outright | (adjective) without reservation or exception | Synonyms: straight-out, unlimited |
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| outside | (adjective) relating to or being on or near the outer side or limit | - |
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| (adjective) located, suited for, or taking place in the open air | Synonyms: out-of-door, outdoor |
| (adjective) leading to or from the outside | - |
| (adjective) originating or belonging beyond some bounds | - |
| (adjective) functioning outside the boundaries or precincts of an organized unit | - |
| (adjective) coming from the outside | Synonyms: external, extraneous |
| (adjective) from or between other countries | Synonyms: external, international |
| (adjective) (of a baseball pitch) on the far side of home plate from the batter | Synonyms: away |
| (adjective) on or toward an outer edge | - |
| (adjective) unlikely to occur | Synonyms: remote |
| outsize | (adjective) larger than normal for its kind | Synonyms: outsized, oversize, oversized |
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| outsized | (adjective) larger than normal for its kind | Synonyms: outsize, oversize, oversized |
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| outspoken | (adjective) given to expressing yourself freely or insistently | Synonyms: vocal |
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| (adjective) characterized by directness in manner or speech; without subtlety or evasion | Synonyms: blunt, candid, forthright, frank, free-spoken, plainspoken, point-blank, straight-from-the-shoulder |
| outspread | (adjective) fully extended in width | Synonyms: spread |
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| outstanding | (adjective) having a quality that thrusts itself into attention | Synonyms: prominent, salient, spectacular, striking |
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| (adjective) of major significance or importance | Synonyms: great |
| (adjective) distinguished from others in excellence | - |
| (adjective) owed as a debt | Synonyms: owing, undischarged |
| outstretched | (adjective) fully extended especially in length | - |
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