stupider; stupidest
1
: not intelligent : having or showing a lack of ability to learn and understand things
She angrily described her boss as a stupid old man.
He had a stupid expression on his face.
I'm not stupid enough to fall for that trick.
2
: not sensible or logical : foolish
Why are you being so stupid?
It was stupid of me to try to hide this from you.
We were stupid to wait so long before we made a decision.
I did some pretty stupid things when I was young.
a stupid movie
a silly, stupid song
a stupid decision/mistake
3
: not able to think normally because you are drunk, tired, etc.
Two glasses of wine are enough to make me stupid.
I was stupid with fatigue.
4
informal
—used to refer to something in an angry or irritated way
The stupid car won't start.
Where did I put those stupid keys?
Cite this Entry
“Stupid.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/stupid. Accessed 19 Jun. 2026.
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