have your doubts
have (one's) doubts (about someone or something)
To be wary or uncertain of someone or something. I know you really love this neighborhood, but I have my doubts. I do have my doubts about Brian—he just seems untrustworthy to me.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have your ˈdoubts (about something)have reasons why you are not certain about whether something is good or whether something good will happen: I’ve had my doubts about his work since he joined the company. ♢ It may be all right. Personally, I have my doubts.
Farlex Partner Idioms Dictionary © Farlex 2017