tr.v. ex·as·per·at·ed, ex·as·per·at·ing, ex·as·per·ates
1. To make very angry or impatient; annoy greatly.
2. To increase the gravity or intensity of: "a scene ... that exasperates his rose fever and makes him sneeze" (Samuel Beckett).
[Latin exasperāre, exasperāt- : ex-, intensive pref.; see EX- + asperāre, to make rough (from asper, rough).]
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.