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"perpetual" is also used as a crossword clue. If that's what you saw, the answer is often everlasting (11 letters).
Definitions
uninterrupted in time and indefinitely long continuing
Word origin
From Middle English perpetuel, from Old French perpetuel, from Latin perpetuālis (“universal”), from perpetuus, from petō.
Used in a sentence
“perpetual copyright”
“There are perpetual requests for changes as new payloads and new demands and modifications are suggested by the users.”
“By means of artificial hybridization, practised for a series of years, he has succeeded in producing a race of carnations which are perpetual bloomers.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Always continuing”9 letters
02“Never-ending”9 letters
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