Archaic Melancholy in appearance or temperament; gloomy.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "adust" in a sentence
"These symptoms vary according to the mixture of those four humours adust, which is unnatural melancholy."
"His complexion was of the kind which used to be called adust -- burnt up with inner fires; his visage was long and somewhat harshly designed, very apt, it would seem, to the expression of hitter ironies or stern resentments, but at present bright with friendly pleasure."
"What if the Iranians actually see Israel as an expansionist power seeking to adust its borders at the expense of fellow Muslims."