ichidan verb, intransitive verb
act timid; show diffidence; look ashamed
Usually used in negative sentences (e.g., 悪びれず, 悪びれない) to describe someone acting without embarrassment or hesitation, often in a situation where they might be expected to feel guilty or shy.
彼は悪びれずに嘘をついた。
He told a lie without any sign of shame.
彼女は悪びれる様子もなく、堂々と
She carried herself with confidence, showing no embarrassment at all.