| 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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| fundamental | (adjective) being or involving basic facts or principles | Synonyms: rudimentary, underlying |
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| (adjective) serving as an essential component | Synonyms: cardinal, central, key, primal |
| (adjective) far-reaching and thoroughgoing in effect especially on the nature of something | Synonyms: profound |
| fundamentalist | (adjective) of or relating to or characteristic of Protestant fundamentalism or its adherents | Synonyms: fundamentalistic |
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| (adjective) of or relating to or tending toward ideological fundamentalism | Synonyms: fundamentalistic |
| fundamentalistic | (adjective) of or relating to or characteristic of Protestant fundamentalism or its adherents | Synonyms: fundamentalist |
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| (adjective) of or relating to or tending toward ideological fundamentalism | Synonyms: fundamentalist |
| funded | (adjective) furnished with funds | - |
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| funerary | (adjective) of or for or relating to a funeral | - |
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| funereal | (adjective) suited to or suggestive of a grave or burial | Synonyms: sepulchral |
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| fungal | (adjective) of or relating to fungi | Synonyms: fungous |
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| fungible | (adjective) of goods or commodities; freely exchangeable for or replaceable by another of like nature or kind in the satisfaction of an obligation | - |
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| fungicidal | (adjective) capable of destroying fungi | Synonyms: antifungal |
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| fungoid | (adjective) resembling fungi | Synonyms: funguslike |
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| fungous | (adjective) of or relating to fungi | Synonyms: fungal |
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| funguslike | (adjective) resembling fungi | Synonyms: fungoid |
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| funicular | (adjective) relating to or operated by a cable | - |
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| funky | (adjective) in a state of cowardly fright | - |
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| (adjective) (of jazz) having the soulful feeling of early blues | Synonyms: low-down |
| (adjective) offensively malodorous | Synonyms: fetid, foetid, foul-smelling, foul, ill-scented, noisome, smelly, stinking |
| (adjective) stylish and modern in an unconventional way | - |
| funny | (adjective) arousing or provoking laughter | Synonyms: amusing, comic, comical, laughable, mirthful, risible |
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| (adjective) experiencing odd bodily sensations | - |
| (adjective) not as expected | Synonyms: fishy, shady, suspect, suspicious |
| (adjective) beyond or deviating from the usual or expected | Synonyms: curious, odd, peculiar, queer, rum, rummy, singular |