dull

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