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dimwit

American  
[dim-wit] / ˈdɪmˌwɪt /

noun

Slang.
  1. a stupid or slow-thinking person.

    Synonyms:
    dumbbell, booby, numbskull, nitwit, dummy

dimwit British  
/ ˈdɪmˌwɪt /

noun

  1. informal a stupid or silly person

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of dimwit

An Americanism dating back to 1920–25; dim + wit 1

Explanation

A dimwit is a person who's not very smart. If you catch your friend sending a text message while he's driving, you can yell at him to put his phone down and call him a dimwit. No one wants to be called a dimwit, since it implies incompetence and a low IQ — it's important to use this word carefully to avoid offending someone. Still, when your brother leaves a pizza unattended in a room with his two big dogs, you'll probably have to say, "Well of course they ate it, you dimwit." The word was coined in the US, as 1920s college slang.

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Vocabulary lists containing dimwit

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

She had a Twitter tiff with Donald Trump Jr. last September; after he made an online comment about Navarro’s weight, she called him a dimwit.

From Seattle Times • Aug. 4, 2022

Socrates-Plato-Xenophon: Remarkably, one of these chaps was the dimwit of the group.

From Washington Post • Aug. 25, 2019

“Amadeus” serves Joseph no better than it does Salieri, portraying the ruler as a dithering dimwit.

From The New Yorker • May 27, 2019

Eastwood has made violent films, arty films, heartwarming films and a handful of dimwit comedies.

From The Guardian • Aug. 3, 2017

“Yes. In the cave,” Alexander said, kindly and a bit slowly, as if talking to a dimwit.

From "The Unseen Guest" by Maryrose Wood