calloused

The word 'calloused' originates from the Latin noun callus, meaning "hard skin." This Latin term is believed to have a Proto-Indo-European root kal-/kel-, associated with concepts of hardness, a lineage it shares with words like "callus" and "callosity." The adjective 'callous' developed in English to describe physically hardened skin, and the addition of the '-ed' suffix forms a participial adjective specifying a state or condition. The modern figurative sense, describing emotional hardness or insensitivity, is a semantic extension that likens an unfeeling disposition to the tactile insensitivity of thickened skin.

Structure: callous (hardened skin) + ed (adjective suffix) callous: From Latin callosus, meaning "hard-skinned," from callus (hardened skin). ed: A Germanic-derived suffix used to form adjectives from nouns or other adjectives, indicating possession of a quality.