doubt

[1]	disbelieve , discredit , mistrust , distrust , have misgivings (about) , question , suspect
[2]	hesitate , waver , vacillate , fluctuate , scruple , be uncertain , entertain doubts , have reservations

[1]	uncertainty , incertitude , dubiety , doubtfulness , dubiousness
[2]	dubiousness , doubtfulness , question
[3]	uncertainty , hesitation , misgiving , reservation(s) , qualm , anxiety , worry , apprehension , disquiet , fear
[4]	distrust , mistrust , suspicion , incredulity , scepticism , dubiousness , dubiety/dubiosity , lack of faith/conviction , irresolution