(n.) The quality of being commonplace; commonness.

banalness bromide chestnut cliche commonness commonplace commonplace expression commonplaceness corn corniness familiar tune familiarness fustiness hackneyed saying hackneyedness lieu commun locus communis mustiness old joke old saw old song old story platitude platitudinousness prosaicism prosaism prose reiteration retold story rubber stamp shibboleth squareness staleness stereotyped saying tag trite saying triteness triticism truism twice-told tale unoriginality