Definitions of dirty:

• verb:   make soiled, filthy, or dirty
• adjective:   expressing or revealing hostility or dislike

  Example: "Dirty looks"

• adjective:   obtained illegally or by improper means

  Example: "Dirty money"

• adjective:   (of a manuscript) defaced with changes

  Example: "Foul (or dirty) copy"

• adjective:   vile; despicable

  Example: "A dirty (or lousy) trick"

• adjective:   (of color) discolored by impurities; not bright and clear

  Example: "Dirty is often used in combination"

• adjective:   unpleasantly stormy

  Example: "There's dirty weather in the offing"

• adjective:   soiled or likely to soil with dirt or grime

  Example: "Dirty unswept sidewalks"

• adjective:   (of behavior or especially language) characterized by obscenity or indecency

  Example: "Dirty words"

• adjective:   spreading pollution or contamination; especially radioactive contamination

  Example: "The air near the foundry was always dirty"

• adjective:   unethical or dishonest

  Example: "Dirty police officers"

• adjective:   contaminated with infecting organisms

  Example: "Dirty wounds"

• adjective:   violating accepted standards or rules

  Example: "A dirty fighter"