...I shall not break my oath, though your orders now seem to me needlessly callous and selfish... 
Baroness Orczy 「El Dorado」
... for it was so difficult to speak to this callous wretch...
Baroness Orczy 「El Dorado」
...In proportion as the mind grows callous to its degradation, and all sense of manly pride is lost, the slave feels comfort...
Thomas Clarkson 「The History of the Rise, Progress and Accomplishment of the」
...Naturally out of this the West Indian servant climbed out of slaveryinto citizenship, for few West Indian masters—fewer Spanish orDutch—were callous enough to sell their own children into slavery...
W. E. B. Du Bois 「Darkwater」
... when it becomes chroniccauses such a bony enlargement (exostosis) as is seen in the callous formationfollowing the fracture of a bone...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...A sense of superhuman awfulness, of personal nothingness andirresistible power, is what these stupendous structures inspire ineven the most callous spectator...
Hugh Macmillan 「Roman Mosaics」
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