Characteristic of an ass (an asshole): objectionably inconsiderate or jerky.
Philo Vance is an asinine jerk - a rude, Nietzschean snob who holds most of the people he meets and the things he sees in utter disdain. He's an insufferable smarty-pants, always convinced he's right and that everyone else is wrong. Of course, he is right, but that doesn't make him any less of a jerk.
Of, pertaining to, or characteristic of donkeys.
Don Quixote had put himself but a little way ayont the village of Don Diego, when he encountered two apparent priests, or students, and two husbandmen, who came mounted on four asinine beasts.
From Latin asinīnus (“of a donkey or ass”).
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