Adjective nutty has 2 senses
  1. nutty, nutlike - having the flavor of nuts; "a nutty sherry"
    Antonym: tasteless (indirect, via tasteful)
  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"
    Antonym: sane (indirect, via insane)
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