Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb callous

1 sense of callous

Sense 1
callous, cauterize, cauterise -- (make insensitive or callous; deaden feelings or morals)
       => inure, harden, indurate -- (cause to accept or become hardened to; habituate; "He was inured to the cold")

Antonyms of adj callous

2 senses of callous

Sense 1
callous, indurate, pachydermatous -- (emotionally hardened; "a callous indifference to suffering"; "cold-blooded and indurate to public opinion")

INDIRECT (VIA insensitive) -> sensitive -- (being susceptible to the attitudes, feelings, or circumstances of others; "sensitive to the local community and its needs")

Sense 2
calloused, callous, thickened -- (having calluses; having skin made tough and thick through wear; "calloused skin"; "with a workman's callous hands")

INDIRECT (VIA tough) -> tender, untoughened -- (physically untoughened; "tender feet")

Similarity of adj callous

2 senses of callous

Sense 1
callous, indurate, pachydermatous -- (emotionally hardened; "a callous indifference to suffering"; "cold-blooded and indurate to public opinion")
       => insensitive (vs. sensitive) -- (deficient in human sensibility; not mentally or morally sensitive; "insensitive to the needs of the patients")

Sense 2
calloused, callous, thickened -- (having calluses; having skin made tough and thick through wear; "calloused skin"; "with a workman's callous hands")
       => tough (vs. tender), toughened -- (physically toughened; "the tough bottoms of his feet")