forgiveness (n.)youdaoicibaDictYouDict
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.).
unforgiven (adj.)youdaoicibaDictYouDict
early 15c., from un- (1) "not" + past participle adjective from forgive (v.). Old English had unforgifen.