foolish, unintelligent, or silly; stupid:
It is surprising that supposedly intelligent people can make such asinine statements.
of or like an ass:
asinine obstinacy; asinine features.
Historical Examples

The man sinks; the animal soars—thrusting his jaw out sidewise in a satisfied yawn, secure in the serenity of his asininity.
The Army Mule and Other War Sketches Henry A. Castle

Still, he could not comprehend how they had had the asininity to “decline” it at all.
A Black Adonis Linn Boyd Porter

Nature has kindly preordained that there shall be no bar in the intimate relations of humanity and asininity.
Letters of Peregrine Pickle George P. Upton

These receptions are stupefying in their asininity, but they come to pass in most consulates, and those at Tunis are no exception.
In the Land of Mosques & Minarets Francis Miltoun

obstinate or stupid
resembling an ass

c.1600, “obstinate, stupid,” from Latin asininus “stupid,” literally “like an ass,” from asinus “ass,” also “dolt, blockhead” (see ass (n.1)). The literal sense in English is recorded from 1620s.

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