Endless

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Old English endelēas (see end, -less).

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From Middle English endeles, from Old English endelēas(“endless”), from Proto-Germanic *andijalausaz(“endless”), equivalent to end +‎ -less.

etymonline

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endless (adj.)

Old English endeleas "boundless, eternal;" see end (n.) + -less. Compare Old Saxon endilos, Dutch eindeloos, German endlos. Related: Endlessly; endlessness. Old English used endeleasnes for "infinity, eternity."