Webster's Revised Unabridged Dictionary · 1913

Dubious

Dubious , adjective

[Latin dubius, dubiosus, from duo two. See Two, and compare Doubt.]

1.
Doubtful or not settled in opinion; being in doubt; wavering or fluctuating; undetermined.
Dubious policy. — Sir T. Scott
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.