2 Verbs to Use for the Word inveteracy

He has brought back the doctrines of Calvinism in all their inveteracy, and relaxed the inveteracy of his northern accents.

Of that bequest demands were afterwards said to have been frequently and roughly made by her son, the great King of Prussia, between whom and his uncle subsisted much inveteracy.'

2 Verbs to Use for the Word  inveteracy