dull

abate arid barren benumbed bland blank bleary blear bloodless blunt blunter boring bored bromidic chalky cheerless cloudy colorless colorless corny darker dampen dark darkest deaden depress depresses dense denser dimmer dimmer dingy diffuse dim dim dim dim-witted dismal dowdy downcast dragging drawling dumber dysphoric earthy dreary dumb dusky dumbest everyday expressionless faint fade faded fainter feeble-minded fatuous frumpy fusty frumpish garden-variety glassy gloomy gloomy half-witted harden gravest grave hazy heavy-hearted hebetudinous heavy heavy heaviest heaviest hokey ho-hum hollow humdrum idiotic imbecile inapt inanimate inactive inexpressive inert inkhorn insentient institutional interminable iterative jejune lagging lackadaisical languishing lazy lazier leaden leaden lethargic listless lumpish matter-of-fact mediocre melancholic menial mid mild mitigate monotonous more boring most inactive most vacuous mousy musty muffled muddy murky muffle nondescript numb obtuse opaque ordinary overcast overused pale pale pales pallid pasty pedantic pedantical phlegmatic plain platitudinous platitudinal pokerfaced ponderous ponderous prolonged prosaic purblind quell quelled quietened quieten ready-made reiterative repetitive relieve relieves repetitious roily roiled rustic sallow shush silence simple simple-minded simpler slack slack slavish slothful slow slow slow-witted slowest slowest slower slower smoggy soft softer somber somnifacient soporific spiritless stale stereotyped stereotypical stock stolid stocker stuffy stultify stupefy stupefy stuporous stupid stupefies stupefies sullen supine tarnish tarnishes tasteless tepid thick thick thick-witted thickheaded threadbare thoughtless tiresome torpid tristful trite turn unappealing uncomprehending undistinguished unexceptional uninteresting unmotivated unperceptive unprogressive unsavory unsightly vacuous warmed-over washed-out waterish weaker weak weakest weariful wearisome wearisome whiten