brazen
adj.adj. doing something shocking or bad without feeling embarrassed or ashamed. You use this to describe someone who is bold in a way that is a bit rude.
adj. bold and without shame; characterized by a lack of concern for social propriety or the consequences of one's actions. Often carries a negative connotation of being insolent or defiant.
He told a brazen lie to the police.
The thief made a brazen attempt to steal the painting in broad daylight while the museum was full of tourists.
The company's brazen disregard for environmental regulations eventually led to a massive public relations crisis and several high-profile resignations from the board.
From Middle English brasen, from Old English bræsen (“brazen, of brass”); equivalent to brass + -en (compare golden, wooden, etc.). The word originally meant “of brass”; the figurative verb sense (as in brazen it out (“face impudently”)) dates from the 1550s (perhaps evoking the sense “face like brass, unmoving and not showing shame”), and the adjective sense “impudent” from the 1570s. Compare brass neck, bold as brass.
Typically used to modify nouns related to behavior, such as 'lie', 'attempt', or 'disregard'.