ㄔㄥˊˋㄅㄨˋㄗㄨˊchéngshì‑bùzúㄅㄞˋˋㄧㄡˇˊbàishì‑yǒuyú

成事不足,败事有余
  1. 好事能力不夠但是敗壞事情能力有餘 此人能力成事不足,敗事有餘不可重用」。

unable to accomplish anything but liable to spoil everything (idiom)​, unable to do anything right, never make, but always mar