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Adjective: kooky (kookier,kookiest)  kookee
  1. Informal or slang term for mentally irregular
    - balmy [archaic], barmy, bats, batty, bonkers, buggy [N. Amer], cracked, crackers, daft, dotty, fruity, haywire, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky

Sounds like: cookie, cooky

Derived forms: kookiest

See also: insane, kook [N. Amer]