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Use "mercifulness" in a sentence
"The designation Good Samaritan has become so associated with the idea of mercifulness, that I doubt not there are many persons who have the impression that Samaritans in the ancient Hebrew days were people specially noted for their benevolent disposition."
"Despite its putative uncanonicity, it is only due to the "mercifulness" of the other Patriarchates that it barely enjoys communion at all."
"He reads Machiavelli, Ignatius of Loyola, Marx and Hegel; he is cold and unmerciful to mankind, out of a kind of mathematical mercifulness."