[kōng xū]
hollow; void; aeriality; inanity; inanition
lack mental or spiritual ballast; be impractical in one's thinking
思想空虚
The enemy rear is weakly defended.
敌人后方空虚。
The death of her husband left a big blank in her life.
她丈夫的去世使她在生活中感到茫然空虚。
There was an aching void in his heart.
他心中有悲痛的空虚感.