英语词汇callous的起源、历史背景-英语词源词典

词汇	callous
词源	callous [LME] The Latin source callosus means ‘hard-skinned’, and the word was originally used in this sense. The transference to ‘insensitive to others’ feelings’, which happened in the mid 17th century, has a parallel in thick-skinned. Callus [M16th], for hardened skin, is from the same word.
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