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Definition of capricious : Governed or characterized by caprice; apt to change suddenly; freakish; whimsical; changeable.

Synonyms:

madcap, change, unprompted, bizarre, hotheaded, unpredictable, flaky, outre, impetuous, freakish, fantastic, outlandish, mercurial, continue, driving, study at inconstant, off-the-wall, surprise, brainish, unstable, ticklish, fantastical, unsteady, tearaway, freaky, flakey, gonzo, temperamental

capricious (part of speech: adjective)

fluctuating, fitful, scatterbrained, frivolous

irresolute (part of speech: adjective)

insipid, undecided, shrinking, changeable, inconsistent, spineless, fly-by-night, shifty, infirm, shy, unresolved, irresponsible, unwilling, undependable, double-minded, tentative, irresolute, uncertain, dillydallying, weak, watery, unsure, yellow, shilly-shally, halfhearted, erratic, hesitant, vacillating

motiveless (part of speech: adjective)

careless, chancy, reasonless, flighty, fleeting, haphazard, ambivalent, indecisive, irregular, systemless, whimsical, motiveless, fickle, sporadic, nonsystematic, flitting, wandering, fanciful, rambling, spastic, unmethodical, volatile, wayward, random, adrift, impulsive, arbitrary

irregular (part of speech: adjective)

inconstant, uneven, asymmetric, variable, jerky, eccentric, desultory, unsystematic, intermittent, unrhythmical

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