| defunct | (adjective) having ceased to exist or live | - |
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| (adjective) no longer in force or use; inactive | - |
| dysfunctional | (adjective) impaired in function; especially of a bodily system or organ | - |
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| (adjective) (of a trait or condition) failing to serve an adjustive purpose | Synonyms: nonadaptive |
| functional | (adjective) designed for or capable of a particular function or use | - |
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| (adjective) involving or affecting function rather than physiology | - |
| (adjective) relating to or based on function especially as opposed to structure | - |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: operative, running, working |
| (adjective) designed for or adapted to a function or use | - |
| (adjective) fit or ready for use or service | Synonyms: operable, operational, usable, useable |
| functioning | (adjective) performing or able to perform its regular function | - |
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| malfunctioning | (adjective) not performing or able to perform its regular function | Synonyms: nonfunctional |
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| nonfunctional | (adjective) not having or performing a function | - |
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| (adjective) not performing or able to perform its regular function | Synonyms: malfunctioning |
| perfunctory | (adjective) hasty and without attention to detail; not thorough | Synonyms: casual, cursory, passing, superficial |
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| (adjective) done or produced as a formality only | Synonyms: pro forma |
| unfunctional | (adjective) not related to or suitable for everyday needs or activities | - |
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