1. Burned; scorched: "The brandished sword of God before them blazed ... with torrid heat, and vapor as the Libyan air adust" (John Milton).
3. Melancholy in appearance or temperament; gloomy.
[Middle English, from Latin adustus, past participle of adūrere, to set fire to : ad-, ad- + ūrere, to burn.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.