Wiktionary
unforgivingness
n. The quality of being unforgiving.
Usage examples of "unforgivingness".
Meanwhile the plot of her unforgivingness against Aswarak ripened: and the Vizier beholding the bride he had lost Queen of Mashalleed his master, it was as she conceived, that his heart was eaten with jealousy and fierce rage.
She knew not how such an offence as hers might be classed by the laws of worldly politeness, to what a degree of unforgivingness it might with propriety lead, nor to what rigours of rudeness in return it might justly make her amenable.