耍赖 (shuǎ lài): to act shamelessly; to refuse to acknowledge that one has lost the game, or made a promise etc; to act dumb; to act as if sth never happened

The five-year-old little brother was about to lose at chess, so he deliberately threw the pieces on the floor and cried that the others were cheating; his mother criticized him for acting shamelessly.

He was unwilling to accept losing the match, so he lay on the ground acting shamelessly, insisting that the referee judge it again; the audience couldn't bear to watch.

They agreed that whoever arrived late would treat everyone, but Xiao Li came late and yet made all kinds of excuses, refusing to pay; his friends all said he was acting shamelessly.

Little sister wanted to eat ice cream, but her mother didn't agree, so she sat on the ground acting shamelessly, crying and making a fuss; in the end, her mother had no choice but to buy her one.

He borrowed money and never paid it back; every time I urge him, he finds excuses to put it off—he's simply acting shamelessly.