BARMY

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

(adjective) informal or slang terms for mentally irregular; “it used to drive my husband balmy”

zestful, yeasty, zesty, barmy

(adjective) marked by spirited enjoyment

Source: WordNet® 3.1

Etymology 1

Adjective

barmy (comparative barmier, superlative barmiest)

(rare) Containing barm, i.e. froth from fermented yeast.

Etymology 2

Adjective

barmy (comparative barmier, superlative barmiest)

(chiefly, British) Odd, strange, or crazy.

Synonyms: dotty, goofy, wacko

Usage notes

• in US English, balmy is usual for sense (2); elsewhere this is occasionally found but some authorities consider it erroneous, despite its probable etymology.