Stupidity/stuːˈpɪdəti/ Definition 1 of 1Pro Tip 1/3Negative Connotation Stupidity implies a harsh judgment and should be used carefully to avoid offending someone. Calling his idea stupidity made him feel disrespected. Pro Tip 2/3Self-Deprecation Sometimes used humorously about oneself to admit a mistake without harsh feelings. I forgot my keys again, what a moment of stupidity! Pro Tip 3/3Momentary Lapse Can refer to a temporary lack of judgment, not a permanent trait. Her decision was a moment of stupidity, not her usual behavior.