doubt

Synonyms: agnosticism ambiguity apprehension confusion demurral difficulty diffidence dilemma disbelief discredit disquiet distrust dubiety dubiousness faithlessness faltering fear hesitancy hesitation incertitude incredulity indecision irresolution lack of confidence misgiving mistrust perplexity problem qualm quandary rejection reluctance scruple skepticism suspense suspicion uncertainty vacillation wavering

Antonyms: belief certainty confidence dependence faith reliance trust

Synonyms: be apprehensive of be curious be dubious be in a quandary be puzzled be uncertain be undetermined call in question challenge demur disbelieve discredit dispute distrust fear fluctuate give no credence harbor suspicion have qualms hesitate imagine impugn insinuate misdoubt misgive mistrust not buy query read differently scruple shilly-shally skepticize smell a rat surmise suspect take dim view of vacillate waver wonder at

Antonyms: be certain believe not question rely trust