Freak

n. [Scot. frak, frech, freck, to move swiftly, A-S. frec, fric, frac, bold, greedy, O. H. Ger. freh, N. H. Ger. frech, Icel. frekr, Goth. friks; Icel. freka, to increase, quicken.] A sudden causeless change or turn of the mind; a whim or fancy; a capricious prank. She is restless and peevish, and sometimes in a freak will instantly change her habitation. Spectator. Brisk youth appeared, the morn of youth. With freaks of graceful folly. Wordsworth. Syn.—Whim; fancy; caprice; folly; sport. See WHIM.