adust I. \əˈdəst, (ˈ)a|d-\adjective Etymology: Middle English, from Latin adustus, past participle of adurere to set fire to, inflame, from ad- + urere to burn — more at ember 1.: dried up with heat : burned, scorched, parched < a vast desert all adust > 2.archaic: of a burned or especially sunburned appearance < a tall, thin man, of an adust complexion — Sir Walter Scott > 3.: of a gloomy appearance or disposition < a wizened adust old servant > II. noun (-s) : leather 4