callous

adjective

1. made hard; hardened.
2. insensitive; indifferent; unsympathetic: They have a callous attitude toward the sufferings of others.
3. having a callus; indurated, as parts of the skin exposed to friction.

verb (used with or without object)

4. to make or become hard or callous.

adjective

1. unfeeling; insensitive
2. (of skin) hardened and thickened

verb

3. pathol to make or become 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” appeared in English by 1670s. Related: Callously; callousness.

adj.

1. Of, relating to, or characteristic of a callus or callosity.