ㄇㄨˋㄖㄣˊrénˊshíㄒㄧㄣxīn

  1. 木作比喻沒有知覺任何外在事物不足以晉書··隱逸·》:木人石心。』會稽不知所終。」鐵石心腸

lit. body made of wood, heart made of stone (idiom)​, fig. heartless