Webster's Revised Unabridged Dictionary · 1913

Tartarous

Tartarous , adjective

[Compare French tartareux.]

Containing tartar; consisting of tartar, or partaking of its qualities; tartareous.

Tartarous , adjective

Resembling, or characteristic of, a Tartar; ill-natured; irritable.
The Tartarous moods of common men. — B. Jonson