Meaning

adjective covered with a layer of dust

adjective lacking originality or spontaneity; no longer new

originFrom Middle English dusty, dusti, from Old English dūstiġ, dystiġ, dȳstiġ (“dusty”), equivalent to dust + -y. Cognate with Dutch donzig (“cottony, downy, woolly”), German dunstig (“hazy, misty”).

Etymology from Wiktionary, CC BY-SA 3.0