| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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| cooperative | (adjective) done with or working with others for a common purpose or benefit | - |
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| (adjective) involving the joint activity of two or more | Synonyms: concerted, conjunct, conjunctive, united |
| (adjective) willing to adjust to differences in order to obtain agreement | Synonyms: accommodative |
| improper | (adjective) not suitable or right or appropriate | - |
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| (adjective) not appropriate for a purpose or occasion | Synonyms: wrong |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: unconventional, unlawful |
| inoperable | (adjective) not suitable for surgery | - |
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| (adjective) not able to perform its normal function | - |
| inoperative | (adjective) not working or taking effect | - |
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| interoperable | (adjective) able to exchange and use information | - |
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| nonoperational | (adjective) (military) not involved in military operations | Synonyms: inactive |
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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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| postoperative | (adjective) happening or done after a surgical operation | - |
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| preoperative | (adjective) happening or done before and in preparation for a surgical operation | - |
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| proper | (adjective) marked by suitability or rightness or appropriateness | - |
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| (adjective) appropriate for a condition or purpose or occasion or a person's character, needs | Synonyms: right |
| (adjective) having all the qualities typical of the thing specified | - |
| (adjective) limited to the thing specified | - |
| propertied | (adjective) owning land or securities as a principal source of revenue | Synonyms: property-owning |
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| propertyless | (adjective) of those who work for wages especially manual or industrial laborers | Synonyms: blue-collar, wage-earning, working-class |
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| pseudoperipteral | (adjective) having columniation completely circling an area of the structure | Synonyms: peristylar |
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| uncooperative | (adjective) unwilling to cooperate | - |
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| (adjective) intentionally unaccommodating | Synonyms: disobliging |