incidental adj.

VERBS be | become | consider sth, declare sth, deem sth The fact that the concert made a profit was considered incidental.

ADV. completely, entirely, purely Any resemblance of a character in this book to a living person is purely incidental. | merely Information skills are not merely incidental to the curriculum but central to it. | almost | seemingly

PREP. to It's just a risk incidental to the job.