Spreading dirt; polluting: The air near the foundry was always dirty.
Apt to soil with dirt or grime: a dirty job at the garage.
Contaminated with bacteria or other infectious microorganisms.
Squalid or filthy; run-down: dirty slums.
Obscene or indecent: dirty movies; a dirty joke.
Malicious or scandalous: a dirty lie.
Unethical or corrupt; sordid: dirty politics.
Not sportsmanlike: dirty players; a dirty fighter.
Acquired by illicit or improper means: dirty money.
Slang Possessing or using illegal drugs.
Unpleasant or distasteful; thankless: Laying off workers is the dirty part of this job.
Extremely unfortunate or regrettable: a dirty shame.
Expressing disapproval or hostility: gave us a dirty look.
Not bright and clear in color; somewhat dull or drab. Often used in combination: dirty-blonde hair; dirty-green walls.
Producing a very great amount of long-lived radioactive fallout. Used of nuclear weapons.
Stormy; rough: dirty weather.
verb: -ied, -y·ing, -ies.
transitive verb
To make soiled.
To stain or tarnish with dishonor.
intransitive verb
To become soiled.
derivatives
dirt́i·ly
adverb
dirt́i·ness
noun
synonyms:
dirty, filthy, foul, squalid, grimy These adjectives apply to what is unclean, impure, or unkempt. Dirty is the most general: dirty clothes; dirty sidewalks. Something that is filthy is disgustingly dirty: filthy rags. Foul suggests gross offensiveness, particularly to the sense of smell: a foul stench; a foul pond. Squalid suggests dirtiness, wretchedness, and sordidness: lived in a squalid apartment. Grimy describes something ingrained or smudged with dirt or soot: grimy hands.
The American Heritage® Dictionary of the English Language, Fourth Edition