1. (noun) A foolish, silly, or stupid person. The term is often used to describe someone who acts in a ridiculous or idiotic manner, making silly mistakes or poor decisions.


The new intern was such a nincompoop, always forgetting important tasks and making a mess of simple assignments, much to the frustration of his co-workers.

Fun Fact

The origin of “nincompoop” is a bit of a mystery, but it is believed to have first appeared in English in the 17th century. One theory suggests that it might be derived from the Latin phrase “non compos mentis,” meaning “not of sound mind,” which was often used in legal contexts to describe someone who was mentally incompetent. Over time, the phrase could have been corrupted and simplified into “nincompoop.” Another theory proposes that “nincompoop” could be related to the Dutch word “ninkkempoep,” meaning a dull or slow-witted person. Regardless of its exact origins, “nincompoop” has become a popular and humorous term for describing someone who acts foolishly or stupidly, often with a touch of affectionate exasperation at their silly behavior.