asininity

The quality of being asinine; obstinate stupidity

He speaks of certain actions of the president of the cabinet as throwing an ugly light upon his character; he calls an apparently dishonest vote of another member of the cabinet “rotten” (hundsföttisch, which is even stronger and not translatable); and he mentions, without comment, “Lenz’s asininity”—not an unduly strong term, for Lenz, his gifted but mentally unsound Strassburg friend, had for Goethe's sake been hospitably received at the Weimar court and had had committed an indiscretion which made him quite impossible there.

An asinine remark, behaviour, etc.