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Use "hardheartedness" in a sentence
"If you assume that a person in need is scamming you and refuse to help, your hardheartedness is your sin."
"We do, as Bernstein writes, need a "broader debate" to get at the nexus of poverty and child welfare, but if the terms of that debate are simply "hardheartedness" and "compassion," we won't get very far."
"Shouldn't the president and his team be banging home the ridiculousness of these claims -- and the hardheartedness of those who make them?"