drab -
lacking in liveliness or charm or surprise; "her drab personality"; "life was drab compared with the more exciting life style overseas"; "a series of dreary dinner parties"
dull (of business) not active or brisk; "business is dull (or slow)"; "a sluggish market"
drab -
causing dejection; "a blue day"; "the dark days of the war"; "a week of rainy depressing weather"; "a disconsolate winter landscape"; "the first dismal dispiriting days of November"; "a dark gloomy day"; "grim rainy weather"
cheerless,
depressing,
uncheerful causing sad feelings of gloom and inadequacy; "the economic outlook is depressing"; "something cheerless about the room"; "a moody and uncheerful person"; "an uncheerful place"