i-adjective
Describes a person or attitude that is unapologetically bold, often in a negative way, showing no shame or fear of consequences.
彼のふてぶてしい態度には呆れた。
I was appalled by his impudent attitude.
あの子は叱られてもふてぶてしい顔をしている。
That kid has a brazen look even when scolded.