冷血动物

冷血动物

Literally means:

a cold-blooded animal

Actually means:

an unfeeling and cold-hearted person

It is a popular term for poikilothermal animal (whose body temperature changes with its surrounding temperature). This phrase metaphorically means an unfeeling person. It usually connotes someone is indifferent and unsympathetic to other people or matters. Derogatory.

变温（体温随环境温度的变化而变化）动物的俗称，比喻没有感情的人。多指对人对事十分冷漠，缺乏爱心、同情心的人。具有贬义色彩。