dubious

/ˈdü-bē-əs/

Latin dubius, from dubare to vacillate; akin to Latin duo two

adjective

  1. unsettled in opinion : doubtful

  2. giving rise to uncertainty: such as

  3. of doubtful promise or outcome

I was dubious about the plan.

doubtful dubious problematic questionable mean not affording assurance of the worth, soundness, or certainty of something. doubtful implies little more than a lack of conviction or certainty. dubious stresses suspicion, mistrust, or hesitation.