adjective, dirtier, dirtiest.
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 ).
verb (used with object), verb (used without object), dirtied, dirtying.
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.

1520–30; dirt + -y1

dirtily, adverb
dirtiness, noun

1. grimy, defiled. Dirty, filthy, foul, squalid refer to that which is not clean. Dirty is applied to that which is filled or covered with dirt so that it is unclean or defiled: dirty clothes. Filthy is an emphatic word suggesting something that is excessively soiled or dirty: filthy streets. Both dirty and filthy can refer to obscenity: a dirty mind, a filthy novel. Foul implies an uncleanness that is grossly offensive to the senses: a foul odor. Squalid, applied usually to dwellings or surroundings, implies dirtiness that results from the slovenly indifference often associated with poverty: a squalid tenement. 3. base, vulgar, low, shabby, groveling. 4. nasty, lascivious, lecherous. 10. rainy, foul, sloppy, disagreeable, nasty. 12. dull, dark, sullied, clouded. 15. soil, befoul, sully.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
dirty (ˈdɜːtɪ)
adj , dirtier, dirtiest
1.  covered or marked with dirt; filthy
2.  a.  obscene; salacious: dirty books
 b.  sexually clandestine: a dirty weekend
3.  causing one to become grimy: a dirty job
4.  (of a colour) not clear and bright; impure
5.  unfair; dishonest; unscrupulous; unsporting
6.  mean; nasty: a dirty cheat
7.  scandalous; unkind: a dirty rumour
8.  revealing dislike or anger: a dirty look
9.  (of weather) rainy or squally; stormy
10.  (of an aircraft) having projections into the airstream, such as lowered flaps
11.  Compare clean (of an explosive device) modified to cause radioactive contamination
12.  slang (Austral) be dirty on to be offended by or be hostile towards
13.  dirty dog a despicable person
14.  informal dirty linen intimate secrets, esp those that might give rise to gossip
15.  slang chiefly (US), (Canadian), (Austral) dirty pool dishonest behaviour
16.  dirty word
 a.  an obscene word
 b.  something that is regarded with disapproval: federalism is a dirty word
17.  dirty work unpleasant or illicit activity
18.  informal (Brit) do the dirty on to behave meanly or unkindly towards
vb , dirtier, dirtiest, dirties, dirtying, dirtied
19.  to make or become dirty; stain; soil

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1500, from dirt + -y (2). Meaning "Smutty, morally unclean" is from 1590s. Dirty linen "personal or familial secrets" is first recorded 1860s.
Online Etymology Dictionary, © 2010 Douglas Harper
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