infelicity

他在正式晚宴上开的不得体的玩笑让所有人都感到不舒服。

The ___infelicity of his joke at the formal dinner made everyone uncomfortable.

他在正式晚宴上穿着牛仔裤，这种不雅之举让主人很尴尬。

His wearing jeans to the formal dinner was an ___infelicity that embarrassed the host.