The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Germanic*un-
- Proto-West Germanic*un-
- Old Englishun-
- Middle Englishun-
- Englishun-
- Proto-Indo-European*peh₂ḱ-
- Proto-Indo-European*péh₂ḱs
- Proto-Italic*pāks
- Latinpāx
- Latinpācō
- Old Frenchpaiier
- Middle Englishpayen
- Englishpay
- Englishpayable
- English todayunpayable
Etymology from Wiktionary, CC BY-SA 4.0.