dirty

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Soiled, as with dirt; unclean.
2. adj. Spreading dirt; polluting: The air near the foundry was always dirty.
3. adj. Apt to soil with dirt or grime: a dirty job at the garage.
4. adj. Contaminated with bacteria or other infectious microorganisms.
5. adj. Squalid or filthy; run-down: dirty slums.
6. adj. Obscene or indecent: dirty movies; a dirty joke.
7. adj. Malicious or scandalous: a dirty lie.
8. adj. Unethical or corrupt; sordid: dirty politics.
9. adj. Not sportsmanlike: dirty players; a dirty fighter.
10. adj. Acquired by illicit or improper means: dirty money.
11. adj. Slang Possessing or using illegal drugs.
12. adj. Unpleasant or distasteful; thankless: Laying off workers is the dirty part of this job.
13. adj. Extremely unfortunate or regrettable: a dirty shame.
14. adj. Expressing disapproval or hostility: gave us a dirty look.
15. adj. Not bright and clear in color; somewhat dull or drab. Often used in combination: dirty-blonde hair; dirty-green walls.
16. adj. Producing a very great amount of long-lived radioactive fallout. Used of nuclear weapons.
17. adj. Stormy; rough: dirty weather.
18. v. To make soiled.
19. v. To stain or tarnish with dishonor.
20. v. To become soiled.

Century Dictionary and Cyclopedia

1. Consisting of or imparting dirt or filth; causing foulness; soiling: as, a dirt mixture; dirt work.
2. Characterized by dirt; unclean; not cleanly; sullied: as, dirty hands; dirty employment.
3. Appearing as if soiled; dark-colored; impure; dingy.
4. Morally unclean or impure; base; low; despicable; groveling: as, a dirty fellow; a dirty job or trick.
5. Repulsive to sensitive feeling; disagreeable; disgusting.
6. Foul; muddy; squally; rainy; sloppy; uncomfortable: said of the weather or of roads. Synonyms Filthy, Foul, etc. See nasty.
7. Unclean, soiled, sullied, begrimed.
8. 4 and Vile, scurvy, shabby, sneaking, despicable, contemptible, gross, obscene.
9. To defile; make filthy; soil; befoul: as, to dirty the clothes or hands.
10. To soil or tarnish morally; sully.

Wiktionary

1. adj. Unclean; covered with or containing unpleasant substances such as dirt or grime.
2. adj. That makes one unclean; corrupting, infecting.
3. adj. Morally unclean; obscene or indecent, especially sexually.
4. adj. Dishonourable; violating accepted standards or rules.
5. adj. Corrupt, illegal, or improper.
6. adj. Out of tune.
7. adj. Of color, discolored by impurities.
8. adj. computing Containing data which need to be written back to a larger memory.
9. adj. slang Carrying illegal drugs among one's possessions or inside of one's bloodstream.
10. adj. informal Used as an intensifier, especially in conjunction with "great".
11. adv. In a dirty manner.
12. v. transitive To make (something) dirty.
13. v. transitive To stain or tarnish (somebody) with dishonor.
14. v. transitive To debase by distorting the real nature of (something).
15. v. intransitive To become soiled.

GNU Webster's 1913

1. adj. Defiled with dirt; foul; nasty; filthy; not clean or pure; serving to defile
2. adj. Sullied; clouded; -- applied to color.
3. adj. Sordid; base; groveling.
4. adj. Sleety; gusty; stormy.
5. v. To foul; to make filthy; to soil.
6. v. To tarnish; to sully; to scandalize; -- said of reputation, character, etc.

WordNet 3.0

1. adj. expressing or revealing hostility or dislike
2. v. make soiled, filthy, or dirty
3. adj. unpleasantly stormy
4. adj. violating accepted standards or rules
5. adj. spreading pollution or contamination; especially radioactive contamination
6. adj. obtained illegally or by improper means
7. adj. (of behavior or especially language) characterized by obscenity or indecency
8. adj. soiled or likely to soil with dirt or grime
9. adj. (of color) discolored by impurities; not bright and clear
10. adj. vile; despicable.
11. adj. contaminated with infecting organisms
12. adj. unethical or dishonest
13. adj. (of a manuscript) defaced with changes