无忧无虑

無憂無慮
wúyōuwúlǜ
(idiom) carefree; without worries

CEDICT

Entry Composition

1 无 wú
  1. not to have
  2. no
  3. none
  4. not
  5. to lack
  6. un-
  7. -less
2 忧 yōu
  1. to worry
  2. to concern oneself with
  3. worried
  4. anxiety
  5. sorrow
  6. (literary) to observe mourning
3 无 wú
  1. not to have
  2. no
  3. none
  4. not
  5. to lack
  6. un-
  7. -less
4 虑 lǜ
  1. to think over
  2. to consider
  3. anxiety