- made hard; hardened.
- insensitive; indifferent; unsympathetic: They have a callous attitude toward the sufferings of others.
- having a callus; indurated, as parts of the skin exposed to friction.
verb (used with or without object)
- to make or become hard or callous.
- unfeeling; insensitive
- (of skin) hardened and thickened
- pathol to make or become callous
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.
- Of, relating to, or characteristic of a callus or callosity.