"nutty" in the adjective sense

1. nutty, nutlike

having the flavor of nuts

"a nutty sherry"

2. balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky

informal or slang terms for mentally irregular

"it used to drive my husband balmy"

Source: WordNet® (An amazing lexical database of English)

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