foolishness
nounUK /ˈfuːlɪʃnəs/
US /ˈfuːlɪʃnəs/
Foolishness is when someone does silly things that are not smart.
It was foolishness to leave the door open in the rain.
OTHER MEANINGS
2. Behavior that shows a lack of good sense or judgment.
His foolishness cost him the game.
3. A silly or pointless act or idea.
The plan was pure foolishness from the start.
4. The quality of being easily tricked or not thinking clearly.
She laughed at her own foolishness for believing the rumor.