bê·tise 
(bā-tēz)
(bā-tēz)n. pl. bêtises (-tēz)
1. Stupidity; folly: "The bêtise of our human community is everywhere" (Thornton Wilder).
2. A stupid or foolish act or remark.
[French, from bête, beast, fool, foolish, from Old French beste, beast; see BEAST.]