What is the meaning of drab?

noun

• A dull greyish to yellowish or light olive brown.
  • synonyms: olive drab

adjective

• Lacking in liveliness or charm or surprise.
  • usage: "her drab personality"; "life was drab compared with the more exciting life style overseas"; "a series of dreary dinner parties"
  • synonyms: dreary
• Lacking brightness or color; dull.
  • usage: "drab faded curtains"; "sober Puritan grey"; "children in somber brown clothes"
  • synonyms: sober, somber, sombre
• Of a light brownish green color.
  • synonyms: olive-drab
• Causing dejection.
  • usage: "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"
  • synonyms: blue, dark, dingy, disconsolate, dismal, gloomy, grim, sorry, drear, dreary