1. a foolish or stupid person
Usage: informal

Examples

• Don’t be such a nincompoop and forget your keys again.
• He felt like a nincompoop after realizing his mistake.
• The nincompoop drove the wrong way down a one-way street.
• She called him a nincompoop for believing such an obvious lie.
• Only a nincompoop would try to fix electrical wiring without turning off the power.
• The movie’s villain was portrayed as a bumbling nincompoop.