dull

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