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shameless; brazen and unscrupulous
厚顔無恥な要求に周囲は呆れた。
Everyone was appalled by the shameless demand.
厚顔無恥にも嘘を重ねて弁解した。
He shamelessly piled lies upon lies in his defense.
あの政治家の厚顔無恥ぶりには驚かされる。
That politician's brazenness is astonishing.