Callous
Callous 既可以形容身体上的皮肤变硬（老茧），更常用来形容心理上的冷漠，对不属于自己的痛苦无动于衷。
- His callous disregard for the feelings of others made him very unpopular. (他对他人的感受漠不关心，这使他很不受欢迎。)
- It was a callous remark that hurt her deeply. (那是一句冷酷无情的话，深深地伤害了她。)
- Years of working in the war zone had made him callous to suffering. (在战区工作的多年使他对苦难变得冷漠。)
- 源自拉丁语：callum (硬皮/老茧)。
联想 callus (老茧)。心上起了“老茧”，所以感觉不到别人的痛苦，这就是 callous。
The callous landlord evicted the family right before Christmas. (那位冷酷无情的房东在圣诞节前夕把那一家人赶了出来。)