The quality or state of being asinine; extreme foolishness combined with stubborn obstinacy.
From Latin asinus (donkey) + '-inity' suffix formation, creating an abstract noun that captures the characteristic foolish stubbornness of a donkey as a human character flaw.
Medieval scholars wrote about the 'asininity' of their enemies in formal Latin, and when English adopted this word, it brought all that contemptuous weight—it's not casual name-calling but refined, educated mockery.
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