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nutty (adj.)

early 15c., "nut-like," from nut (n.) + -y (2); from 1660s as "abounding in nuts." Sense of "having the flavor of nuts" is by 1828. Slang meaning "crazy" is by 1898 (see nuts); earlier colloquial sense was "amorous, in love (with)," 1821. [Byron, in a slangy passage in "Don Juan" (1823) uses it of a beggar's doxy; a footnote defines it as "conjointly, amorous and fascinating."] Related: Nuttiness.

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Definitions of nutty from WordNet

nutty (adj.)
having the flavor of nuts;
a nutty sherry
Synonyms: nutlike
nutty (adj.)
informal or slang terms for mentally irregular;
Synonyms: balmy / barmy / bats / batty / bonkers / buggy / cracked / crackers / daft / dotty / fruity / haywire / kooky / kookie / loco / loony / loopy / nuts / round the bend / around the bend / wacky / whacky
From wordnet.princeton.edu