Dubious

1. adjective

   open to doubt or suspicion; ; ; ; - Karen Horney

   “the candidate's doubtful past”

   Similar: doubtful, dubitable, in question

2. adjective

   fraught with uncertainty or doubt

   “they were doubtful that the cord would hold”

   Similar: doubtful

3. adjective

   not convinced

   “they admitted the force of my argument but remained dubious”