inveteracy

[in-vet-er-uh-see]

noun

the quality or state of being inveterate or deeply ingrained: the inveteracy of people's prejudices.

Origin of inveteracy

First recorded in 1710–20; inveter(ate) + -acy

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

The impudence, the inveteracy of that fellow, is astonishing—no silencing him.
Tales And Novels, Volume 8 (of 10)
Maria Edgeworth
They have the same sort of inveteracy as dogs have for the ill-dressed canaille.
George Eliot's Life, Vol. I (of 3)
George Eliot
Their constant tendency is to increase in virulence and inveteracy.
Plain Facts for Old and Young
John Harvey Kellogg
“The New Yorkers never forgave him,” says your latest biographer; and one scarcely marvels at the inveteracy of their malice.
Letters to Dead Authors
Andrew Lang
The inveteracy of opposition to the administration of Mr. Adams was systematic, violent, and unprincipled.
Memoir of the Life of John Quincy Adams.
Josiah Quincy

1690s, from inveterate + -cy.