Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary




Synonyms and Antonyms of uncertain

  1. 1 likely to change frequently, suddenly, or unexpectedly <the stifling heat would occasionally be relieved by an uncertain breeze> Synonyms capricious, changeable, changeful, flickery, fluctuating, fluid, inconsistent, inconstant, mercurial, mutable, skittish, temperamental, fickle, unpredictable, unsettled, unstable, unsteady, variable, volatileRelated Words aimless, arbitrary, desultory, erratic, haphazard, hit-or-miss, irregular, random, scattered, slapdash, stray; ambivalent, hesitating, shaky, shilly-shally, shilly-shallying, vacillating, wavering; dicey, undependable, unreliable, untrustworthy; adaptable, mobile, protean, versatileNear Antonyms equable, even, uniform; abiding, durable, lasting, permanent, persistent; dependable, reliable, sure, tried, tried-and-true, true, trustworthy, trustyAntonyms certain, changeless, constant, immutable, invariable, predictable, settled, stable, stationary, steady, unchangeable, unchanging, unvarying

  2. 2 not feeling sure about the truth, wisdom, or trustworthiness of someone or something <never uncertain of her political beliefs or judgment, she was a decisive and fearless leader> Synonyms distrustful, dubious, hinky [slang], mistrustful, skeptical, suspicious, trustless, doubtful, unconvinced, undecided, unsettled, unsureRelated Words ambivalent, conflicted, equivocal; diffident, insecure; halting, hesitant, indecisive, irresolute, vacillating, waveringNear Antonyms assured, confident, sanguine, self-assured; decisive, determined, resoluteAntonyms certain, convinced, positive, sure

Seen and Heard

What made you want to look up uncertain? Please tell us where you read or heard it (including the quote, if possible).


having a blissful appearance

Get Word of the Day daily email!