成事不足，敗事有餘

成事不足，败事有余
chéngshìbùzú,bàishìyǒuyú
  1. unable to accomplish anything but liable to spoil everything (idiom)
  2. unable to do anything right
  3. never make, but always mar

CEDICT

Entry Composition

1 成事 chéngshì
  1. to accomplish the objective
  2. to succeed
2 不足 bùzú
  1. insufficient
  2. lacking
  3. deficiency
  4. not enough
  5. inadequate
  6. not worth
  7. cannot
  8. should not
3 敗事 bàishì to fail in something; to bungle; to spoil something
4 有餘 yǒuyú to have an abundance