Simple Definition of moron
: a very stupid or foolish person
Examples of moron in a sentence
They were acting like a bunch of morons.
I can't believe I did something so stupid. I feel like a complete moron.
Origin and Etymology of moron
irregular from Greek mōros foolish, stupid
First Known Use: 1910
MORON Defined for Kids
Definition of moron for Students
: a stupid or foolish person
Seen and Heard
What made you want to look up moron? Please tell us where you read or heard it (including the quote, if possible).