be dubious

distrust hesitate impugn suspect

challenge demur disbelieve discredit dispute fear fluctuate imagine insinuate misgive mistrust query scruple surmise vacillate waver

be apprehensive of be curious be in a quandary be puzzled be uncertain be undetermined call in question give no credence harbor suspicion have qualms misdoubt not buy read differently shilly-shally skepticize smell a rat take dim view of wonder at

trust

agree answer believe go along remain stay

be certain not question rely

be apprehensive of be curious 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 one's doubts have qualms hesitate imagine impugn insinuate misgive mistrust not buy query question read differently scruple shilly-shally skepticize smell a rat surmise suspect take dim view of vacillate waver wonder wonder at