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Use "heartlessness" in a sentence
"As a matter of fact, what you call heartlessness is sheer broad-mindedness on my part."
"Specs were lowered, true, but the reason that the Conservative Party were able to attend to immediate need, did not lie in heartlessness."
"The death had left no regret upon her; it only gave her for a while a graver shadow over the brilliancy of her youth and of her beauty, and gave her for always -- or for so long, at least, as she chose to use it -- a plea for that indifference to men's worship of her which their sex called heartlessness; which her own sex thought an ultra-refined coquetry; and which was, in real truth, neither the one nor the other, but simply the negligence of a woman very difficult to touch, and, as it had seemed, impossible to charm."