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co‧in‧ci‧den‧tal

purely/completely/entirely coincidental
Any similarity between this film and real events is purely coincidental.
Any similarity between this film and real events is purely coincidental. —coincidentally adverb [sentence adverb]
We have become profitable. Not coincidentally, we have only half as many employees as we did in 1988.
We have become profitable. Not coincidentally, we have only half as many employees as we did in 1988.