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"endlessness" is also used as a crossword clue. If that's what you saw, the answer is often infinity (8 letters).
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E__________
Definitions
the property of being (or seeming to be) without end
Word origin
From Middle English endelesnesse, from Old English endelēasnes; equivalent to endless + -ness.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
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