DUBIOUS, adjective [Latin See Doubt. The primary sense is probably to turn or to waver.] 1. Doubtful; wavering or fluctuating in opinion; not settled; not determined; as, the mind is in a dubious state. 2. Uncertain; that of which the truth is not ascertained or known; as a dubious question. 3. Not clear; not plain; as dubious light. 4. Of uncertain event or issue. In dubious battle.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI