Forgiveness

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Old English forgiefenes, from forgiefen (past participle of forgiefan ‘forgive’) + the noun suffix -nes .

wiktionary

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From Middle English forgiveness, forgifnes, from Old English forġifnes, forġiefnes, forġiefennes(“forgiveness, remission, indulgence, permission”, literally “forgivenness”), equivalent to forgiven +‎ -ness. Cognate with Dutch vergiffenis.

etymonline

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forgiveness (n.)

Old English forgiefnes, forgifennys "pardon, forgiveness, indulgence," from past participle of forgifan (see forgive) + -ness. Contracted from *forgiven-ness. Middle English also had forgift (early 14c.).