monotony, monotonousness, tediousness, dullness, boredom, ennui, uneventfulness, lack of variety, lack of variation, lack of interest, lack of excitement, sameness, unchangingness, uniformity, routineness, humdrumness, dreariness, mundaneness, wearisomeness, tiresomeness, dryness, aridity, lifelessness, colourlessness, featurelessness, slowness, banality, vapidity, insipidity, blandness, prosaicness, jejuneness
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