crackers

(s) informal or slang terms for mentally irregular
- it used to drive my husband balmy
around the bend, balmy, bats, batty, bonkers, buggy, daft, dotty, haywire, kookie, kooky, loco, loony, nuts, round the bend, barmy, fruity, loopy, nutty, wacky, whacky, cracked,

Synonyms

around the bend balmy bats batty bonkers buggy daft dotty haywire kookie kooky loco loony nuts round the bend barmy fruity loopy nutty wacky whacky cracked

Words of close approximity

cracked cracker