carefree

a. 无忧无虑的,不负责的

card-game, card-sharp (also card-sharper), card-table, cardamom, cardboard, cardi(o)-, cardiac, cardigan, cardinal, cardinal points, cardiologist, cardiology, care, care about, care for, care nothing about, careen, career, career girl (also career woman), careerist, careful, carefully, carefulness, careless, carelessly, carelessness, caress, caret, caretaker, careworn, carfare, cargo, Caribbean, caribou, caricature, caricaturist, caries, carillon, caring, carious,