He certainly seems to have been the reverse of athletic (the stalwart Aeschines upbraids him with never having been a sportsman), and he probably had some sort of defect or impediment in his speech as a boy.
He upbraids Roscellinus, for example, because he was unable to conceive whiteness apart from its existence in something white.
So Gregory of Narck upbraids the Thonraki for their "anthropolatrous apostasy, their selfconf erred contemptible priesthood which is a likening of themselves to Satan" (= Christ in Thonraki parlance).
The only positive piece of evidence produced is the passage from Thomas Nash's "Epistle to the Gentlemen of the Two Universities," prefixed to Greene's Arcadia, 1859, in which he upbraids somebody (not known to be Shakespeare) with having left the "trade of Noverint" and busied himself with "whole Hamlets" and "handfuls of tragical speeches."