The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Latinred-
- Proto-Indo-European*h₁em-
- Proto-Indo-European*h₁émeti
- Proto-Italic*emō
- Latinemō
- Latinredimō
- Old Frenchredimer
- Middle Englishredemen
- Englishredeem
- Englishredeemable
- English todayunredeemable
From un- + redeemable.
Etymology from Wiktionary, CC BY-SA 4.0.