a long-eared, slow, patient, sure-footed domesticated mammal, Equus asinus, related to the horse, used chiefly as a beast of burden.

any wild species of the genus Equus, as the onager.

a stupid, foolish, or stubborn person.

noun

blockhead * , dolt , donkey * , dope , dunce , fool , idiot , imbecile , jackass * , jerk * , nitwit * , numbskull * , simpleton * , twit , jackass , mooncalf , moron , nincompoop , ninny , nitwit , simple , simpleton , softhead , tomfool , burro , donkey , jackass. associated word: bray , jenny