动不动

動不動
dòngbudòng
  1. (typically followed by 就 jiù) apt to (lose one's temper, catch a cold etc)
  2. at the drop of a hat

CEDICT

Entry Composition

1 动 dòng
  1. (of sth) to move
  2. to set in movement
  3. to displace
  4. to touch
  5. to make use of
  6. to stir (emotions)
  7. to alter
  8. abbr. for 动词 dòngcí, verb
2 不动 bùdòng motionless