dull

abate arid barren benumbed blank bland blear bleary bloodless blunt blunter boring bored bromidic chalky cheerless cloudy colorless colorless corny dampen darkest dark darker deaden denser dense depress depresses diffuse dimmer dimmer dim dim dim dim-witted dingy dismal dowdy downcast dragging drawling dreary dumber dumb dumbest dusky dysphoric earthy everyday expressionless faded fade fainter faint fatuous feeble-minded frumpish frumpy fusty garden-variety glassy gloomy gloomy gravest grave half-witted harden hazy heaviest heaviest heavy-hearted heavy heavy hebetudinous ho-hum hokey 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 muddy muffled muffle murky musty nondescript numb obtuse opaque ordinary overcast overused pale pale pales pallid 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 soft softer somber somnifacient soporific spiritless stale stereotypical stereotyped stocker stock stolid stuffy stultify stupefies stupefies stuporous stupefy stupefy stupid sullen supine tarnishes tarnish tasteless tepid thickheaded thick-witted thick thick thoughtless threadbare tiresome torpid trite tristful turn unappealing uncomprehending undistinguished unexceptional uninteresting unperceptive unmotivated unsavory unprogressive unsightly vacuous warmed-over washed-out waterish weak weaker weakest weariful wearisome wearisome whiten