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Adjective: dubious  d(y)oo-bee-us
  1. Fraught with uncertainty or doubt
    "dubious about agreeing to go";
    - doubtful
  2. Open to doubt or suspicion
    "he has a dubious record indeed"; "what one found uncertain the other found dubious or downright false";
    - doubtful, dubitable, in question, doubtable, questionable
  3. Not convinced
    "they admitted the force of my argument but remained dubious"

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

Encyclopedia: Dubious