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Wordnet 3.0

ADJECTIVE (3)

1. fraught with uncertainty or doubt;
- Example: "they were doubtful that the cord would hold"
- Example: "it was doubtful whether she would be admitted"
- Example: "dubious about agreeing to go"
[syn: doubtful, dubious]

2. open to doubt or suspicion;
- Example: "the candidate's doubtful past"
- Example: "he has a dubious record indeed"
- Example: "what one found uncertain the other found dubious or downright false"
- Example: "it was more than dubitable whether the friend was as influential as she thought"- Karen Horney
[syn: doubtful, dubious, dubitable, in question(p)]

3. not convinced;
- Example: "they admitted the force of my argument but remained dubious"



The Collaborative International Dictionary of English v.0.48:

Dubious \Du"bi*ous\, a. [L. dubius, dubiosus, fr. duo two. See
   Two, and cf. Doubt.]
   1. Doubtful or not settled in opinion; being in doubt;
      wavering or fluctuating; undetermined. "Dubious policy."
      --Sir T. Scott.
      [1913 Webster]

            A dubious, agitated state of mind. --Thackeray.
      [1913 Webster]

   2. Occasioning doubt; not clear, or obvious; equivocal;
      questionable; doubtful; as, a dubious answer.
      [1913 Webster]

            Wiping the dingy shirt with a still more dubious
            pocket handkerchief.                  --Thackeray.
      [1913 Webster]

   3. Of uncertain event or issue; as, in dubious battle.

   Syn: Doubtful; doubting; unsettled; undetermined; equivocal;
        uncertain. Cf. Doubtful.
        [1913 Webster]


WordNet (r) 3.0 (2006):

dubious
    adj 1: fraught with uncertainty or doubt; "they were doubtful
           that the cord would hold"; "it was doubtful whether she
           would be admitted"; "dubious about agreeing to go" [syn:
           doubtful, dubious]
    2: open to doubt or suspicion; "the candidate's doubtful past";
       "he has a dubious record indeed"; "what one found uncertain
       the other found dubious or downright false"; "it was more
       than dubitable whether the friend was as influential as she
       thought"- Karen Horney [syn: doubtful, dubious,
       dubitable, in question(p)]
    3: not convinced; "they admitted the force of my argument but
       remained dubious"