An odd or fanciful or capricious idea:
— He had a whimsy about flying to the moon.
— Whimsy can be humorous to someone with time to enjoy it.

synonyms: notion, whim, whimsey.

Roget 515: imagination; originality; invention; fancy; inspiration; verve.    warm imagination, heated imagination, excited imagination, sanguine imagination, ardent imagination, fiery imagination, boiling imagination, wild imagination, bold imagination, daring imagination, playful imagination, lively imagination, fertile imagination, fancy.    mind's eye;" such stuff as dreams are made of" [Tempest]. ideality, idealism; romanticism, utopianism, castle-building.    dreaming; phrensy^†, frenzy; ecstasy, extasy^†; calenture etc. (delirium) 503^†; reverie, trance; day dream, golden dream; somnambulism.    conception, Vorstellung [G.], excogitation^†, a fine frenzy;" cloudland^†, dreamland; flight of fancy, fumes of fancy; thick coming fancies" [Macbeth]; creation of the brain, coinage of the brain; imagery.    conceit, maggot, figment, myth, dream, vision, shadow, chimera; phantasm, phantasy; fantasy, fancy; whim, whimsey^†, whimsy; vagary, rhapsody, romance, gest^†, geste^†, extravaganza; air drawn dagger, bugbear, nightmare.    flying Dutchman, great sea serpent, man in the moon, castle in the air, pipe dream, pie-in-the-sky, chateau en Espagne [Fr.]; Utopia, Atlantis^†, happy valley, millennium, fairyland; land of Prester John, kindgom of Micomicon; work of fiction etc. (novel) 594; Arabian nights^†; le pot au lait [Fr.]; dream of Alnashar etc. (hope) 858^†.    illusion etc. (error) 495; phantom etc. (fallacy of vision) 443; Fata Morgana etc. (ignis fatuus) [Lat.] 423; vapor etc. (cloud) 353; stretch of the imagination etc. (exaggeration) 549; mythogenesis^†.    idealist, romanticist, visionary; mopus^†; romancer, dreamer; somnambulist; rhapsodist etc. (fanatic) 504; castle-buildier, fanciful projector.    ... show more

Roget 608: caprice, fancy, humor; whim, whimsy, whimsey^†, whimwham^†; crotchet, capriccio, quirk, freak, maggot, fad, vagary, prank, fit, flimflam, escapade, boutade [Fr.], wild-goose chase; capriciousness etc. adj.; kink.    ... show more

Roget 865: desire, wish, fancy, fantasy; want, need, exigency.    mind, inclination, leaning, bent, animus, partiality, penchant, predilection; propensity etc. 820; willingness etc. 602; liking, love, fondness, relish.    longing, hankering, inkling; solicitude, anxiety; yearning, coveting; aspiration, ambition, vaulting ambition; eagerness, zeal, ardor, empressement [Fr.], breathless impatience, overanxiety; impetuosity, etc. 825.    appetite, appetition^†, appetence^†, appetency^†; sharp appetite, keenness, hunger, stomach, twist; thirst, thirstiness; drouth, mouthwatering; itch, itching; prurience, cacoethes [Lat.], cupidity, lust, concupiscence.    edge of appetite, edge of hunger; torment of Tantalus; sweet tooth, lickerish tooth^†; itching palm; longing eye, wistful eye, sheep's eye.    [excessive desire for money] greed etc. 817.1. voracity etc. (gluttony) 957.    passion, rage, furore^†, mania, manie^†; inextinguishable desire; dipsomania, kleptomania.    [Person who desires] lover, amateur, votary, devotee, aspirant, solicitant, candidate, applicant, supplicant; cormorant etc. 957.    [Object of desire] desideratum; want etc. (requirement) 630; a consummation devoutly to be wished;" attraction, magnet, allurement, fancy, temptation, seduction, fascination, prestige, height of one's ambition, idol; whim, whimsy, whimsey^†; maggot; hobby, hobby-horse.    Fortunatus's cap; wishing cap, wishing stone, wishing well.    ... show more

Dutch: gril
Polish: wymysł

The trait of acting unpredictably and more from whim or caprice than from reason or judgment.

synonyms: arbitrariness, capriciousness, flightiness, whimsey, whimsicality.

Dutch: willekeur
Polish: arbitralność