dull

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