dull

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