(n.) The quality or state of being plain.

Atticism Bohemianism accessibility affability apparentness approachability appropriateness artlessness atmospheric visibility austerity baldness bareness bluffness bluntness broadness brusqueness cacophony candidness candor casualness ceiling ceiling unlimited chasteness chastity childlikeness clarity classicalism classicism clear-cutness clearness clumsiness coherence comeliness common speech common touch commonness commonplaceness communicativeness connectedness consistency conspicuity conspicuousness conversableness cordiality correctness crystal-clearness crystallinity defacement definiteness definition dignity directness discrimination disfigurement distinction distinctness dullness dysphemism ease easiness easygoingness elegance elegancy elementarity evidence evidentness explicitness extroversion familiarity felicitousness felicity finish fittingness flatness flow flowing periods fluency folksiness forthrightness frankness freedom freeness fundamentality genuineness good taste grace gracefulness gracelessness gracility graciousness guilelessness high visibility homeliness homespun homeyness homogeneity household words humbleness humility ill-favoredness inelegance informality informalness ingenuousness ingloriousness innocence innocuousness insipidness integrity irregularity leanness limpidity looseness low visibility lowlihood lowliness lucidity manifestness matter of fact matter-of-factness meanness meekness modesty monism naiveness naivete naivety naturalness neatness obviousness offhandedness oneness openheartedness openness openness to sight outgoingness outspokenness overtness palpability patentness pellucidity percipi perspicuity plain English plain dealing plain speaking plain speech plain style plain words plainspokenness polish poorness prominence propriety prosaicism prosaicness prosaism prose prosiness purity refinement relaxedness restrainedness restraint roundness rustic style seeing seemliness severity shapelessness simpleheartedness simplemindedness simpleness simplicity sincerity single-heartedness single-mindedness singleness singleness of heart smallness smoothness soberness sociability spareness starkness straightforwardness structure submissiveness talkativeness tangibility taste tastefulness teachableness terseness transparency transpicuity trustfulness uglification uglifying ugliness unadorned style unadornedness unadulteration unaestheticness unaffectedness unambiguousness unattractiveness unbeautifulness unceremoniousness uncomeliness unconstrainedness unconstraint unconventionality unembellishedness unequivocalness ungainliness ungracefulness unguardedness unhandsomeness unidealism uniformity unimaginativeness unimportance unity unmistakableness unmixedness unpleasingness unpoeticalness unpretentiousness unprettiness unquestionability unrepression unreserve unreservedness unrestraint unrestriction unreticence unromanticism unsecretiveness unshapeliness unsightliness unsophisticatedness unsophistication unsuppression unsuspiciousness untaciturnity unwariness vapidity vernacular visibility visibility unlimited visibility zero