自如

zìrú
  1. unobstructed
  2. unconstrained
  3. smoothly
  4. with ease
  5. freely

CEDICT

Entry Composition

1 自 zì
  1. (bound form) self; oneself
  2. from; since
  3. naturally; as a matter of course
2 如 rú
  1. as
  2. as if
  3. such as