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"accidental" is also used as a crossword clue. If that's what you saw, the answer is often unintended (10 letters).
Definitions
Happening by chance or without planning.
Word origin
From Middle English accidental, from Anglo-Norman accidentel, Middle French accidentel, accidental, and their source, Late Latin accidēntālis; corresponding to accident + -al.
Used in a sentence
“The discovery was purely accidental.”
“He was killed by an accidental gunshot.”
“accidental damage”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“By chance”10 letters
02“happening by luck”10 letters
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