This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Having calluses; toughened: callous skin on the elbow.

adj. Emotionally hardened; unfeeling: a callous indifference to the suffering of others.

v. To make or become callous.

adj. Emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.

adj. Having calluses.

adj. Hardened; indurated.

adj. Hardened in mind; insensible; unfeeling; unsusceptible.

Hard; hardened; indurated, as an ulcer, or the skin on some part of the body from exposure to continuous pressure or friction: as, “a callous cicatrice,” ; “a callous ulcer,”

Hardened in mind or feelings; insensible; unfeeling: as, “the callous diplomatist,”

In entomology, swollen and smooth: as, a callous margin, one very thick and irregularly rounded or lumpy. Synonyms

To harden or make callous.

adj. having calluses; having skin made tough and thick through wear

adj. emotionally hardened

v. make insensitive or callous; deaden feelings or morals

"State Department spokesman Mark Toner says Gbagbo's continued efforts to force a result that he could not obtain at the ballot box show what he calls a "callous disregard for the welfare of the Ivorian people, who will again suffer amid renewed heavy fighting in Abidjan.""

toughened    tough    insensitive   

calloused    callouses    callousing   

harden    indurate    inure   

insensible   

indurated    obdurate    unsusceptible    hardened    hard    insensible    unfeeling    harden    indurate    astorgous   

Alice    Daedalus    Dallas    Palace    Pallas    balas    ballasts    callus    digitalis    gallus   

unfeeling    heartless    cynical    unkind    selfish    inhuman    cold-blooded    ruthless    insensitive    vindictive