When you call something dusty, it's either literally covered in dust or so old and unoriginal that it might as well be.

You can use a feather duster to clean off dusty surfaces, but if something is a dusty color, that just means it's got a grayish tint to it, like dusty pink or dusty blue. If something has been around for a really long time and it's worn-out, stale, or unoriginal, you can also call it dusty. If you're a stand up comedian whose been working the same act for thirty years, chances are your jokes are getting a little dusty.

Definitions of dusty
  1. adjective
    covered with a layer of dust
    “a dusty pile of books”
    synonyms: dust-covered
    overlaid or spread or topped with or enclosed within something; sometimes used as a combining form
  2. adjective
    lacking originality or spontaneity; no longer new
    synonyms: cold, moth-eaten, stale
    not original; not being or productive of something fresh and unusual
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