adj

• (figurative) Old; outdated; stuffily traditional.
  "The very smart practitioners of my acquaintance do not rest their right hand on old dusty knowledge, but bend and move along a ground of being in which they are perpetually on the lookout for what is trusty and true, new and old."
• (African-American Vernacular, slang) Ugly, disgusting (a general term of abuse).
• (British, slang, chiefly in negative constructions) Ugly, unwell, inadequate, bad.
  "...the toilet-glass on the table...had probably reflected few such faces as that of the lady calling herself Mrs. Lloyd, who looked attentively into it when she found herself alone and decided that she was not so very dusty, considering"

noun

• (informal) A miller (from the image of millers being covered in flour dust).
  "I do not like to see too much strife between dusties on the short and long system question, as it is liable to cause hard feelings."
• (military, slang) A supply petty officer.
  "The mess was so overcrowded that hammock-slinging space became the perks of the badgemen the “jack-dusties” invariably slept in their store-rooms and offices."
• (rare) A duststorm.
  "[…] dust storms, does it? Well, nothing like what it used to have: One spring the dusties blew so thick We staked five claims above Clay Crick Fifty foot high in the fallow air. Blows lots worse on the prairie."
• (possibly only in the plural) A clump of dust; a dust bunny.
  "Sparse iron gray hair, stuck on his egg-shaped head like dusties from the vacuum bag, cold pewter eyes in little round metal-rimmed glasses, a sharp, hard nose, a mouth like a slot."

name

• (British) a nickname for someone with the surname Miller