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

moron

noun
 
/ˈmɔːrɒn/
 
/ˈmɔːrɑːn/
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  1. (informal) a rude way to refer to somebody that you think is very stupid
    • They're a bunch of morons.
    • The people responsible for this are mindless morons.
  2. (old-fashioned, offensive) a word for a person with a very low level of intelligence that is now considered offensive
  3. Word Originearly 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 moron in the Oxford Advanced American Dictionary
previously
adverb
 
 
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