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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·nin′i·ty (-nĭn′ĭ-tē) n.