dull

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