Callous
来自Big Physics
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late Middle English (in the Latin sense): from Latin callosus ‘hard-skinned’.
wiktionary
From Latin callōsus(“hard-skinned”), from callum(“hardened skin”) + -ōsus.
etymonline
callous (adj.)
c. 1400, "hardened," in the physical sense, from Latin callosus "thick-skinned," from callus, callum "hard skin" (see callus). The figurative sense of "unfeeling, hardened in the mind" appeared in English by 1670s. Related: Callously; callousness.
