Where does “non-repayable” come from?

non-repayable (English) comes from English repayable, from English repay, from Old French repaier, from Old French paiier, from Medieval Latin pacare, from Latin pācāre, from Latin pāx, from Proto-Italic pāks — to join, to attach; agreement, settlement.

Ancestry of “non-repayable”, step by step

StepLanguageWordMeaning
1EnglishrepayableAble to be repaid; to be repaid; owing; An...
2EnglishrepayTo pay back
3Old Frenchrepaierto pay back
4Old Frenchpaiierto pay
5Medieval Latinpacareto settle, satisfy; present active infinitive of...
6Latinpācāre
7Latinpāxpeace
8Proto-Italicpākspeace
9Proto-Indo-Europeanpéh₂ḱ-speace
10Proto-Indo-Europeanpeh₂ḱ-to join, to attach; agreement, settlement
Every word from Proto-Indo-European peh₂ḱ-
non-repayable — Etymology, Origin & Word History | Etymology Explorer