carefree
adj. 无忧无虑的，无牵挂的；不负责任的
例句
Chantal remembered carefree summers at the beach.
香岱儿想起了在海滩上的那些无忧无虑的夏日。
《柯林斯英汉双解大词典》
She had made their childhood so joyous and carefree.
她使他们的童年生活非常快乐、无忧无虑。
I was heartsick, for I felt that the splendid years of my carefree childhood had come to an end.
我很难过，因为我觉得我无忧无虑的美好童年生活结束了。
