c. 1400, "hardened," in the physical sense, from Latin callosus "thick-skinned," from callus, callum "hard skin" (see callus). The figurative sense of "unfeeling" appeared in English by 1670s. Related: Callously; callousness.
中文解释
1. call- "hard skin" (谐音：铠哦、壳哦 ---- 铠甲哦).
实用例句
1. He is callous about the safety of his workers.
他对他工人的安全毫不关心.
来自《简明英汉词典》
2. The colonists massacred thousands of natives with brutal and callous force.