他心狠她心毒
[tā xīn hĕn tā xīn dú]
These phrases translate as 'He has a ruthless heart; She possesses a poisonous mind.' These stark descriptors imply harsh judgments about individuals who are perceived to lack empathy or exhibit cunning behavior. It reflects deep-seated disappointment or criticism towards others involved in a past personal relationship or conflict where both parties (a man and woman) have shown severe negativity, either through actions against the speaker or another third party.