/ ˈmɔːrɒn; NAmE -rɑːn/ noun
( informal ) an offensive way of referring to sb that you think is very stupid :
They're a bunch of morons.
You moron—now look what you've done!
► mor·on·ic / məˈrɒnɪk; NAmE -ˈrɑːn-/ adjective :
a moronic stare
a moronic TV programme
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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.