Where does “moron” come from?

moron (Turkish) comes from English moron, from Ancient Greek μωρός, from Proto-Indo-European muHrós — dull, stupid.

moron (Turkish): fool, stupid, idiot, moronic; a moron

Definitions

Step	Language	Word	Meaning
1	English	moron	A stupid person; an idiot; a fool; A person of...
2	Ancient Greek	μωρός	slow, sluggish; slow, dull, foolish, stupid;...
3	Proto-Indo-European	muHrós	dull, stupid