"Krook’s last lodger died there," observes Mr. Guppy in an incidental way.
Now although Mr. Bucket walks upstairs to the little library within the larger one with the face of a man who receives some scores of letters every day, it happens that much correspondence is not incidental to his life.
There are no more uses of "incidental" in the book.
Show samples from other sources
Promise me—incidental to the issue—Anglo-Saxon—dirty word—Childe Roland.
Harper Lee -- Go Set a Watchman
Many of the professors used the Socratic method—direct, repetitive, and adversarial questioning—which had the incidental effect of humiliating unprepared students.