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Related to inveteracy: cadaverously
References in classic literature ?
Surely, thought I, all these terrible stories I have heard about the inveteracy with which they carried on the feud, their deadly intensity, of hatred and the diabolical malice with which they glutted their revenge upon the inanimate forms of the slain, are nothing more than fables, and I must confess that I experienced something like a sense of regret at having my hideous anticipations thus disappointed.
Pursued with persistent inveteracy, I cut off my hair, I disguised myself as a woodman.
de Bragelonne, and with such inveteracy was it fought that a hundred and sixty Arabs were left upon the field, by the side of at least fifty of our troops.