canker

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References in classic literature ?
With cankered ingenuity, he sought out his own disease in every breast.
Beside him, an unrolled bundle showed itself as consisting of a ragged overcoat and containing an empty and smoke-blackened tomato can, an empty and battered condensed milk can, some dog-meat partly wrapped in brown paper and evidently begged from some butcher-shop, a carrot that had been run over in the street by a wagon-wheel, three greenish- cankered and decayed potatoes, and a sugar-bun with a mouthful bitten from it and rescued from the gutter, as was made patent by the gutter-filth that still encrusted it.
But it rusted and cankered at your father's heart for years.