The story
- Proto-Germanic · inherited from*andijalausaz“endless”
- Old English · inherited fromendelēas“endless”
- Middle English · inherited fromendeles
- English todayendless
From Middle English endeles, from Old English endelēas (“endless”), from Proto-Germanic *andijalausaz (“endless”), equivalent to end + -less.
Etymology from Wiktionary, CC BY-SA 4.0.