1. [adj]  unpleasantly stormy; "there's dirty weather in the offing"
2. [adj]  soiled or likely to soil with dirt or grime; "dirty unswept sidewalks"; "a child in dirty overalls"; "dirty slums"; "piles of dirty dishes"; "put his dirty feet on the clean sheet"; "wore an unclean shirt"; "mining is a dirty job"; "Cinderella did the dirty work while her sisters preened themselves"
3. [adj]  (of behavior or especially language) characterized by obscenity or indecency; "dirty words"; "a dirty old man"; "dirty books and movies"; "boys telling dirty jokes"; "has a dirty mouth"
4. [adj]  spreading pollution or contamination; especially radioactive contamination; "the air near the foundry was always dirty"; "the air near the foundry was always dirty"; "a dirty bomb releases enormous amounts of long-lived radioactive fallout"
5. [adj]  unethical or dishonest; "dirty police officers"; "a sordid political campaign"
6. [adj]  violating accepted standards or rules; "a dirty fighter"; "used foul means to gain power"; "a nasty unsporting serve"; "fined for unsportsmanlike behavior"
7. [adj]  expressing or revealing hostility or dislike; "dirty looks"
8. [adj]  obtained illegally or by improper means; "dirty money"; "ill-gotten gains"
9. [adj]  (of a manuscript) defaced with changes; "foul (or dirty) copy"
10. [adj]  vile; despicable; "a dirty (or lousy) trick"; "a filthy traitor"
11. [adj]  (of color) discolored by impurities; not bright and clear; "dirty" is often used in combination; "a dirty (or dingy) white"; "the muddied gray of the sea"; "muddy colors"; "dirty-green walls"; "dirty-blonde hair"
12. [adj]  contaminated with infecting organisms; "dirty wounds"; "obliged to go into infected rooms"- Jane Austen
13. [v]  make soiled, filthy, or dirty; "don't soil your clothes when you play outside!"

Dirty
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1. \Dirt"y\, a. [Compar. {Dirtier}; superl. {Dirtiest}.]
   1. Defiled with dirt; foul; nasty; filthy; not clean or pure;
      serving to defile; as, dirty hands; dirty water; a dirty
      white. --Spenser.
   2. Sullied; clouded; -- applied to color. --Locke.
   3. Sordid; base; groveling; as, a dirty fellow.
            The creature's at his dirty work again. --Pope.
   4. Sleety; gusty; stormy; as, dirty weather.
            Storms of wind, clouds of dust, an angry, dirty sea.
                                                  --M. Arnold.
   Syn: Nasty; filthy; foul. See {Nasty}.
   

2. \Dirt"y\, v. t. [imp. & p. p. {Dirtied}; p. pr. & vb. n.
   {Dirtying}.]
   1. To foul; to make filthy; to soil; as, to dirty the clothes
      or hands.
   2. To tarnish; to sully; to scandalize; -- said of
      reputation, character, etc.