"they admitted the force of my argument but remained dubious"
open to doubt or suspicion
"the candidate's doubtful past"
"he has a dubious record indeed"
"what one found uncertain the other found dubious or downright false"
"it was more than dubitable whether the friend was as influential as she thought"- Karen Horney
- in question
fraught with uncertainty or doubt
"they were doubtful that the cord would hold"
"it was doubtful whether she would be admitted"
"dubious about agreeing to go"