adj. 快乐的，心情愉快的；无忧无虑的
词根：lighthearted
n.
lightheartedness 无忧无虑；自由自在；轻松愉快
1.I wanted to be brave, eager, confident, at ease, lighthearted.
我想变得勇敢，充满渴望，自信，自在，无忧无虑。
2.The Economist's Big Mac index, a lighthearted guide to valuing currencies, provides some clues.
《经济学人》的“巨无霸指数”，一个衡量币值的轻松指标，提供了一些线索。
3.The movie is infused with lighthearted comedy and a laid-back style.
这部电影是部让人愉快的喜剧，充满了轻松的氛围。
4.Keep a lighthearted approach; you'll have more fun and still be productive and prosperous.
保持轻松的态度；您还可以有更多的乐趣，并生产和繁荣。
5.It is not intended as a fanciful or lighthearted undertaking.
它不应作为一种想象出来的或轻松的任务。
6.He's one of the most lighthearted, optimistic guys I've ever met - always smiling from ear to ear.
他是我见过的最快乐，最乐观的人，他总是眉开眼笑的。