soiled with dirt; foul; unclean

dirty laundry.

spreading or imparting dirt; soiling

dirty smoke.

vile; mean; sordid; contemptible

to play a dirty trick on someone.

obscene; pornographic; lewd

a dirty joke.

undesirable or unpleasant; thankless

He left the dirty work for me.

very unfortunate or regrettable

That's a dirty shame!

not fair or sportsmanlike; unscrupulous

a dirty fighter.

hostile, insulting, contemptuous, or resentful

She gave me a dirty look. He made a dirty crack about the cooking.

(of a nuclear weapon) producing a relatively large amount of radioactive fallout.

(of the weather) stormy; squally

It looks dirty to windward.

Informal . obtained through illegal or disreputable means

dirty money.

appearing as if soiled; dark-colored; dingy; murky.

Slang . using or in possession of narcotics.

Foreign Exchange . (of currency floats) manipulated, as by a central bank influencing or changing exchange rates ( opposed to clean ).

to make or become dirty.

Informal . in a mean, unscrupulous, or underhand way

to play dirty.

Informal . in a lewd manner

to talk dirty.

do (someone) dirty, Slang . to treat unfairly or reprehensibly

as by cheating or slandering.