doubt Synonyms

question uncertainty suspicion scruple hesitation doubtfulness skepticism disbelief reservation indecision concern distrust incredulity incertitude dubiety dubiousness vacillate hesitate hesitancy irresolution apprehension suspense mistrust qualm misgiving challenge opaqueness occultness penumbra pendency suspected smokiness stammering stealthiness stickle suspect pausing perplexity oscillation oppugn questionability pessimism puzzlement questioning questionable questionableness rationalism refutability reluctance reluctancy