étourderie
/ˌeɪˈtʊəd(ə)ri/ /ˌeɪˈtɔːd(ə)ri/noun
Thoughtlessness, carelessness.
Origin
Mid 18th century; earliest use found in David Hume (1711–1776), philosopher and historian. From French étourderie mistake caused by carelessness, thoughtlessness from étourdi + -erie.