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Adjective: doubtful  dawt-ful
  1. Open to doubt or suspicion
    "the candidate's doubtful past";
    - dubious, dubitable, in question, doubtable, questionable
  2. Fraught with uncertainty or doubt
    "they were doubtful that the cord would hold"; "it was doubtful whether she would be admitted";
    - dubious
  3. Unsettled in mind or opinion
    "drew a few doubtful conclusions";
    - tentative
  4. Having a probability too low to inspire belief
    - improbable, unbelievable, unconvincing, unlikely

See also: deniable, implausible, incertain [non-standard], questionable, uncertain, unsettled, unsure

Encyclopedia: Doubtful