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Adjective: loony (loonier,looniest)  loo-nee
  1. Informal or slang term meaning insane, strange, eccentric or stupid
    "it used to drive my husband loony";
    - balmy [archaic], barmy, bats, batty, bonkers, buggy [N. Amer], cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky, daffy, dippy, potty [Brit], nutsy [N. Amer], wacko, round the twist [Brit], daft as a brush [Brit], cuckoo
Noun: loony  loo-nee
  1. Someone deranged and possibly dangerous
    - crazy [N. Amer], looney, nutcase, weirdo, headcase

Sounds like: lo

Derived forms: looniest, loonier, loonies

See also: insane

Type of: lunatic, madman, maniac

Encyclopedia: Loony