1. Insane, strange, eccentric or stupid
   "it used to drive my husband batty";
   - balmy [archaic, slang], barmy [slang], bats [slang], bonkers [slang], buggy [N. Amer, slang], cracked [slang], crackers [slang], daft [Brit, slang], dotty [Brit, slang], fruity [slang], haywire [slang], kooky [slang], kookie [slang], loco [slang], loony [slang], loopy [slang], nuts [slang], nutty [slang], round the bend [slang], around the bend [slang], wacky [slang], whacky [slang], daffy [slang], dippy [slang], doolally [Brit, slang], wacko [slang], daft as a brush [Brit, slang], potty [Brit, slang], round the twist [Brit, slang], dumbass [N. Amer, slang], nutsy [N. Amer, slang], barking mad [Brit, slang], mental [slang], barking [Brit, slang], bughouse [N. Amer, slang], cuckoo [slang]

Derived forms: battiest, battier

See also: insane

Encyclopedia: Batty, Michael