Stupid/ˈstuːpɪd/ Definition 1 of 2Pro Tip 1/3Negative Connotation Stupid' often expresses negativity or criticism, so use it with care. Calling someone's idea stupid can be hurtful. Pro Tip 2/3Self-Deprecation Used about oneself, it can convey humility or humor after a mistake. I can't believe I wore two different shoes to work, how stupid of me! Pro Tip 3/3Intensity It can be used to emphasize the extent of a mistake or poor decision. It was stupid of us to go out in the storm without an umbrella.