What is the meaning of dowdy?

noun

• British marshal of the RAF who commanded the British air defense forces that defeated the Luftwaffe during the Battle of Britain (1882-1970.
  • synonyms: Dowding, Hugh Dowding, Baron Hugh Caswall Tremenheere Dowding
• Deep-dish apple dessert covered with a rich crust.
  • synonyms: pandowdy

adjective

• Lacking in smartness or taste.
  • usage: "a dowdy grey outfit"; "a clean and sunny but completely dowdy room"
• Primly out of date.
  • usage: "nothing so frumpish as last year's gambling game"
  • synonyms: frumpy, frumpish