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"eternal" is also used as a crossword clue. If that's what you saw, the answer is often undying (7 letters).
Definitions
tiresomely long; seemingly without end
Word origin
From Middle English eternal, from Old French eternal, from Late Latin aeternālis, from Latin aeternus (“eternal”), from aevum (“age”). Displaced native Old English ēċe.
Used in a sentence
“But here again it is another question, quite different from our having an idea of eternity, to know whether there were any real being, whose duration has been eternal.”
“Thy smoking altar shall be fat with food / Of incense and the grateful steam of blood; / Burnt-offerings morn and evening shall be thine, / And fires eternal in thy temple shine.”
“some eternal villain”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Without end”7 letters
02“Everlasting”7 letters
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