Dumb | Mean of dumb in English Dictionary

/ˈdʌm/

• not showing or having good judgment or intelligence
1. I'm not dumb enough to believe that.
2. It was a dumb idea in the first place.
3. He just stood there with a dumb grin on his face.
4. This is one of the dumbest TV shows I've ever seen.
5. She played/acted dumb [=pretended to know or understand less than she really did] so we would assign her the easier tasks.
• not requiring or resulting from intelligence
1. It was dumb luck that we found this place at all.
2. His success is just a matter of dumb luck.
• not able to speak especially after being shocked or surprised
1. I was struck dumb [=made speechless] by the surprise.

• not having the ability to speak
1. He was born deaf and dumb.
• Verb
• to make (something) easier to understand
1. She refused to dumb down the language in her report.
2. The movie was a dumbed down version of the play.
• to make (a group of people) less intelligent or educated
1. Cutting training programs will dumb down the American workforce.