From Longman Dictionary of Contemporary Englishmoronmo‧ron /ˈmɔːrɒn $ -rɑːn/ noun [countable] 1 informal not politeSTUPID/NOT INTELLIGENT a very offensive word for someone who you think is very stupid SYN idiotDon’t leave it there, you moron!2 technical old-fashionedMISTUPID/NOT INTELLIGENT someone whose intelligence has not developed to the normal level —moronic /məˈrɒnɪk $ -ˈrɑː-/ adjective a moronic grin
Examples from the Corpus
moron• Most media companies assume members of the general public are morons.• What do you think I am, a complete moron?• He's just an obnoxious moron.• Why'd you put it there, you moron?Origin moron (1900-2000) Greek moros “of low intelligence” 