Roget's Thesaurus: Entry 608 (Caprice)

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#608. Caprice. -- N. caprice, fancy, humor; whim, whimsy, whimsey[obs], whimwham[obs]; crotchet, capriccio, quirk, freak, maggot, fad, vagary, prank, fit, flimflam, escapade, boutade[Fr], wild-goose chase; capriciousness &c. adj.; kink.

V. be capricious &c. adj.; have a maggot in the brain; take it into one's head, strain at a gnat and swallow a camel; blow hot and cold; play fast and loose, play fantastic tricks; tourner casaque[Fr].

Adj. capricious; erratic, eccentric, fitful, hysterical; full of whims &c. n.; maggoty; inconsistent, fanciful, fantastic, whimsical, crotchety, kinky [U. S.], particular, humorsome[obs], freakish, skittish, wanton, wayward; contrary; captious; arbitrary; unconformable &c. 83; penny wise and pound foolish; fickle &c. (irresolute) 605; frivolous, sleeveless, giddy, volatile.

Adv. by fits and starts, without rhyme or reason.

Phr. nil fuit unquain sic inipar sibi[Lat]; the deuce is in him.