| unau | (noun) relatively small fast-moving sloth with two long claws on each front foot | Synonyms: Choloepus didactylus, two-toed sloth, unai |
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| (noun) a sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot | Synonyms: Choloepus hoffmanni, two-toed sloth, unai |
| unauthentic | (adjective) false or fake; not what it appears to be | Synonyms: inauthentic, spurious |
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| unauthorised | (adjective) not endowed with authority | Synonyms: unauthorized |
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| (adjective) without official authorization | Synonyms: unauthorized, wildcat |
| unauthorized | (adjective) not endowed with authority | Synonyms: unauthorised |
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| (adjective) without official authorization | Synonyms: unauthorised, wildcat |