1. 漫不经心：insonate 受声波作用 | insouciance 漫不经心 | insouciant 漫不经心的

2. 无忧无虑：insonate 使受声波作用 | insouciance 无忧无虑 | insoucianceunconcern 漫不经心

3. 漫不经心,无忧无虑：Strenuous 奋发的,费劲的,使劲的 | Insouciance 漫不经心,无忧无虑 | Minimal 最小的,最简单艺术派的

4. 闲情逸致(程雨民译)：D.H.LAWRENCE戴.赫.劳伦斯 | Insouciance 闲情逸致(程雨民译) | JOYCE CARY乔伊斯.凯利

1. 漠不关心;漫不经心
    Insouciance is lack of concern shown by someone about something which they might be expected to take more seriously.

    e.g. He replied with characteristic insouciance: ''So what?''
           他以一贯的漫不经心回答道：“那又怎样？”

1. the cheerful feeling you have when nothing is troubling you

    Synonym: carefreenesslightheartednesslightsomeness