lighthearted
adj.轻松愉快的；无忧无虑的；随便的；漫不经心的
网络解释.无忧无虑且快乐的；快乐的；无忧无虑的；轻松愉快的
cheerful blithe optimistic carefree airy happy buoyant
双语例句
1. 1 . The children looked lighthearted now that the final exam was over.
期终考试结束了,孩子们看上去都很轻松愉快.
来自《简明英汉词典》