自然而然

zìránérrán
  1. involuntary
  2. automatically

CEDICT

Entry Composition

1 自然 zìrán
  1. nature
  2. natural
  3. naturally
2 而 ér
  1. and
  2. as well as
  3. and so
  4. but (not)
  5. yet (not)
  6. (indicates causal relation)
  7. (indicates change of state)
  8. (indicates contrast)
3 然 rán
  1. correct
  2. right
  3. so
  4. thus
  5. like this
  6. -ly