inveterate hatred

See: feud
References in classic literature ?
This prince, besides his ill will to Sultan Segued, which was kept up by some malcontents among the Abyssin nobility, who, provoked at the conversion of their master, were plotting a revolt, entertained an inveterate hatred against the Portuguese for the death of his grandfather, who had been killed many years before, which he swore the blood of the Jesuits should repay.
He spoke upon all subjects except the sciences, alleging in this respect the inveterate hatred he had borne to scholars from his childhood.
To suppose that Wakem had the same sort of inveterate hatred toward Tulliver that Tulliver had toward him would be like supposing that a pike and a roach can look at each other from a similar point of view.
But, imbued from her childhood with a brooding sense of wrong, and an inveterate hatred of a class, opportunity had developed her into a tigress.
Therefore, even the liberal elements in the BJP do not speak out against the inveterate hatred of RSS towards secularism.