Synonyms and related words :
austerity, baldness, bareness, candor, common speech, directness, frankness, homespun, leanness, matter-of-factness, naturalness, openness, plain English, plain speaking, plain speech, plain style, plain words, plainness, prosaicness, prosiness, restrainedness, rustic style, severity, simpleness, simplicity, soberness, spareness, starkness, straightforwardness, unadorned style, unadornedness, unaffectedness, unimaginativeness, unpoeticalness, vernacular