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"permanent" is also used as a crossword clue. If that's what you saw, the answer is often indelible (9 letters).
Definitions
continuing or enduring without marked change in status or condition or place
Word origin
From Middle English permanent, permanente, from Middle French permanent, from Latin permanēns, from permaneō (“to stay through”). First attested in the 15th century.
Used in a sentence
“Nothing in this world is truly permanent.”
“Things that had been permanent and unquestionable were suddenly thrown into doubt.”
“The countries are now locked in a permanent state of conflict.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“lasting forever”9 letters
02“Lasting indefinitely”9 letters
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