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Adjective: batty (battier,battiest)  ba-tee
  1. Informal or slang term meaning insane, strange, eccentric or stupid
    "it used to drive my husband batty";
    - balmy [archaic], barmy, bats, bonkers, buggy [N. Amer], cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky, daffy, dippy, daft as a brush [Brit], potty [Brit], nutsy [N. Amer], wacko, round the twist [Brit], cuckoo

Derived forms: battier, battiest

See also: insane

Encyclopedia: Batty