noun a dull, heavy, stupid fellow; a dolt.
2. ass ·noun a quadruped of the genus equus (e. asinus), smaller than the horse, and having a peculiarly harsh bray and long ears. the tame or domestic ass is patient, slow, and sure-footed, and has become the type of obstinacy and stupidity. there are several species of wild asses which are swift-footed.