Whimsey \Whim"sey\, Whimsy \Whimsy\, n.; pl. {Whimseys}or {Whimsies}. [See {Whim}.] 1. A whim; a freak; a capricious notion, a fanciful or odd conceit. ``The whimsies of poets and painters.'' --Ray. Men's folly, whimsies, and inconstancy. --Swift. Mistaking the whimseys of a feverish brain for the calm revelation of truth. --Bancroft. 2. (Mining) A whim.