情不自禁

qíngbùzìjīn
(idiom) cannot refrain from; cannot help; cannot but

CEDICT

Entry Composition

1 情 qíng
  1. (bound form) feelings; emotion; sentiment; passion
  2. (bound form) situation; condition
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 自 zì
  1. (bound form) self; oneself
  2. from; since
  3. naturally; as a matter of course
4 禁 jīn to endure