adj. dirt·i·er,
dirt·i·est 1. a. Covered or marked with dirt or an unwanted substance; unclean.
b. Spreading dirt; polluting: The air near the foundry was always dirty.
c. Apt to soil with dirt or grime: a dirty job at the garage.
d. Contaminated with bacteria or other infectious microorganisms.
2. Squalid or filthy; run-down: dirty slums.
3. a. Obscene or indecent: dirty movies; a dirty joke.
b. Lewd or lecherous: a dirty mind.
4. a. Unethical or corrupt; sordid: dirty politics.
b. Malicious or scandalous: a dirty lie.
c. Not sportsmanlike: dirty players; a dirty fighter.
d. Acquired by illicit or improper means: dirty money.
e. Slang Possessing or using illegal drugs.
5. a. Unpleasant or distasteful; thankless: Laying off workers is the dirty part of this job.
b. Extremely unfortunate or regrettable: a dirty shame.
6. Expressing disapproval or hostility: gave us a dirty look.
7. Not bright and clear in color; somewhat dull or drab. Often used in combination: dirty-blonde hair; dirty-green walls.
8. a. Relating to or being a bomb that uses a conventional explosive and radioactive material to contaminate an area with low-level radiation.
b. Relating to or being a nuclear weapon that produces a very great amount of long-lived radioactive fallout.
9. Stormy; rough: dirty weather.