dull

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