1. Utterly stupid or silly: asinine behavior.
2. Of, relating to, or resembling an ass.
[Latin asinīnus, of an ass, from asinus, ass, of pre-Roman Mediterranean origin; akin to Armenian ēs, Greek onos, and Hieroglyphic Luwian -asna- in tarkasna-, ass, all probably ultimately from an ancient Near Eastern source akin to Sumerian anše, ass, and perhaps Akkadian atānu, she-ass.]
as′i·nini·ty (-nĭnĭ-tē) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.