dull

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