无忧无虑
... 无忧无虑 = carefreeness 无忧虑 = worriless 无心 = unwittingly ...
轻松愉快
... lightsomeness 轻快(发光) carefreeness 轻松愉快 lightheartedness 自由自在 ...
carefreeness:
carefree + -ness (“the property of”)
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