dull

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