dull

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