1. 轻松的：light-headed 头晕的 | light-hearted 轻松的 | light-heeled 脚步轻盈的

2.

2. 轻松愉快的, 无忧无虑的：idealistic唯心论的, 空想主义的, 唯心主义者的 | light-hearted轻松愉快的, 无忧无虑的 | noncommittal不表示明确意见的, 不表态的;不承诺的;含糊的

3. 轻松愉快的：light-headed 头晕的 | light-hearted 轻松愉快的 | light-minded 轻薄的

4. 乐观：Depressive悲观 | Light-hearted乐观 | Active-Social好动

1. 轻松愉快的；无忧无虑的
    Someone who is light-hearted is cheerful and happy.

    e.g. They were light-hearted and prepared to enjoy life.
           他们无忧无虑，随时准备享受生活。

2. 不严肃的；随便的；为了好玩的
    Something that is light-hearted is intended to be entertaining or amusing, and not at all serious.

    e.g. There have been many attempts, both light-hearted and serious, to locate the Loch Ness Monster.
           有很多人或随意或认真地尝试过，想要找到尼斯湖水怪。

1. carefree and happy and lighthearted

    e.g. was loved for her blithe spirit
           a merry blithesome nature
           her lighthearted nature
           trilling songs with a lightsome heart

    Synonym: blitheblithesomelightheartedlightsome