(n.) The quality or state of being prosaic; a prosaic manner or style.

aridity aridness banality barrenness bromide chestnut cliche commonness commonplace commonplace expression commonplaceness corn dearth of ideas dryness dullness familiar tune flatness hackneyed saying infecundity infertility insipidness lieu commun locus communis matter of fact matter-of-factness old joke old saw old song old story plainness platitude prosaicness prosaism prose prosiness reiteration retold story rubber stamp shibboleth staidness stereotyped saying stolidity stuffiness tag trite saying triticism truism twice-told tale uncreativeness unembellishedness unfancifulness unidealism unimaginativeness unoriginality unpoeticalness unromanticism vapidity