Dictionary.com
Thesaurus.com
Synonyms

nincompoop

American  
[nin-kuhm-poop, ning-] / ˈnɪn kəmˌpup, ˈnɪŋ- /

noun

  1. a fool or simpleton.


nincompoop British  
/ ˈnɪŋ-, ˈnɪnkəmˌpuːp /

noun

  1. a stupid person; fool; idiot

"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

  • nincompoopery noun
  • nincompoopish adjective

Etymology

Origin of nincompoop

First recorded in 1670–80; origin uncertain

Explanation

Calling someone a nincompoop is like calling them a fool, idiot, bonehead, or dope. It's definitely not a compliment. Nincompoop is a silly-sounding word that's also kind of old-fashioned, like ninny. No one has any solid idea where it came from, and anyone who claims otherwise is, well, a nincompoop. By definition, nincompoops are dumb, foolish, and can't do anything right. But there are far worse things you could call someone who's behaving like an idiot. Maybe this old-timey insult deserves a revival?

Keep Reading on Vocabulary.com

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.

A multinational corporation intent on protecting franchises that bring it more than $80 billion a year has thus far made its adversary look like a blustering nincompoop.

From Los Angeles Times • Mar. 30, 2023

And was it enough to let us stop calling him a nincompoop?

From Slate • Dec. 11, 2019

Higher courts, and history, ultimately vindicated John Sirica’s belief that he shouldn’t be “sitting on the bench like a nincompoop and watching the parade go by.”

From Washington Post • Dec. 18, 2018

Pretty soon the goal is sinking each other, proving once and for all that the other person is a complete nincompoop.

From Salon • Jan. 6, 2017

But nincompoop or not, she would have to report to him if she worked for the Navy.

From "The Woman All Spies Fear" by Amy Butler Greenfield