Webster's Revised Unabridged Dictionary · 1913

adust

adust (a*dust") , adjective

[Latin adustus, past participle of adurere: compare French aduste.]

1.
Inflamed or scorched; dried or darkened by heat. — AS
The Libyan air adust. — Milton
2.
Sunburnt. [archaic] — AS
A tall, thin man, of an adust complexion. — Sir W. Scott
3.
(Medicine) Looking or acting depressed; atrabilious; gloomy. [archaic] — AS