dull

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