mo ‧ ron /ˈmɔːrɒn $ -rɑːn/ BrE AmE noun [countable]
[ Date: 1900-2000 ; Language: Greek ; Origin: moros 'of low intelligence' ]
1 . informal not polite a very offensive word for someone who you think is very stupid SYN idiot :
Don’t leave it there, you moron!
2 . technical old-fashioned someone whose intelligence has not developed to the normal level
—moronic /məˈrɒnɪk $ -ˈrɑː-/ adjective :
a moronic grin