1. Doubtful or not settled in opinion; being in doubt; wavering or fluctuating; undetermined. Dubious policy. A dubious, agitated state of mind.
2. Occasioning doubt; not clear, or obvious; equivocal; questionable; doubtful; as, a dubious answer. Wiping the dingy shirt with a still more dubious pocket handkerchief. (Thackeray)
3. Of uncertain event or issue; as, in dubious battle.
Synonym: doubtful, doubting, unsettled, undetermined, equivocal, uncertain. Cf. Doubtful.
Origin: L. Dubius, dubiosus, fr. Duo two. See two, and cf. Doubt.