WordReference Random House Unabridged Dictionary of American English © 2020
a•dust (ə dust′),USA pronunciation adj.
- dried or darkened as by heat.
- [Archaic.]gloomy in appearance or mood.
- Latin adustus (past participle of adūrere), equivalent. to ad- ad- + us- (base of ūrere to burn) + -tus past participle suffix
- late Middle English 1400–50