When you're doubtful about something, you're not sure about it. You might feel doubtful about the picnic you've planned if the forecast calls for torrential rain.

Whether you're uncertain, undecided, or suspicious, you can describe yourself as doubtful. You'll be doubtful about your taxi driver's sense of direction when you pass the same building for the third time. You might also be doubtful about whether or not to try skydiving. Doubtful means "full of doubt," and doubt is from the Old French doter, "doubt or be afraid," with a Latin root, dubitare, "to question, hesitate, or waver in opinion."

Definitions of doubtful
  1. adjective
    fraught with uncertainty or doubt
    “they were doubtful that the cord would hold”
    “it was doubtful whether she would be admitted”
    synonyms: dubious
    incertain, uncertain, unsure
    lacking or indicating lack of confidence or assurance
  2. adjective
    open to doubt or suspicion
    “the candidate's doubtful past”
    synonyms: dubious, dubitable, in question
    subject to question
  3. adjective
    unsettled in mind or opinion
    synonyms: tentative
    still in doubt
Word Family