WordWeb Online

1. Pleasantly without extremes
   "balmy days and nights";
   - mild, soft
    
2. [archaic] Informal or slang term meaning insane, strange, eccentric or stupid
   "it used to drive my husband balmy";
   - barmy, bats, batty, 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, dippy, daffy, wacko, daft as a brush [Brit], potty [Brit], nutsy [N. Amer], round the twist [Brit], cuckoo

Derived forms: balmiest, balmier

See also: clement, insane