The story
- Late Latin · derived fromirremissibilis
- Old French · derived fromirremissible
- Middle English · inherited fromirremyssible
- English todayirremissible
From Middle English irremyssible, from Old French irremissible, from Late Latin irremissibilis, from in- + remissus + -ibilis.
Etymology from Wiktionary, CC BY-SA 4.0.