Definition of moron noun from the Oxford Advanced Learner's Dictionary

 

moron

 noun
noun
BrE BrE//ˈmɔːrɒn//
 
; NAmE NAmE//ˈmɔːrɑːn//
 
(informal) Stupid
 
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an offensive way of referring to somebody that you think is very stupid They're a bunch of morons. You moron—now look what you've done! The people responsible for this are mindless morons. See related entries: Stupid Word Origin early 20th cent. (as a medical term denoting an adult with a mental age of about 8–12): from Greek mōron, neuter of mōros ‘foolish’.
See the Oxford Advanced American Dictionary entry: moron