Adjective

(er)

Displeasing to the eye; not aesthetically pleasing.

* Spenser

the ugly view of his deformed crimes

* (William Shakespeare)

O, I have passed a miserable night, / So full of ugly sights, of ghastly dreams.

Displeasing to the ear or some other sense.

Offensive]] to one's [[sensibility, sensibilities or morality.

*, chapter=12

, title= The Mirror and the Lamp , passage=All this was extraordinarily distasteful to Churchill. It was ugly , gross. Never before had he felt such repulsion when the vicar displayed his characteristic bluntness or coarseness of speech. In the present connexion—or rather as a transition from the subject that started their conversation—such talk had been distressingly out of place.}}

Ill-natured; crossgrained; quarrelsome.

Unpleasant; disagreeable; likely to cause trouble or loss.

Adjective

(er)

Unclean; covered with or containing unpleasant substances such as dirt or grime.

*

That makes one unclean; corrupting, infecting.

Morally unclean; obscene or indecent, especially sexually.

Dishonourable; violating accepted standards or rules.

* {{quote-magazine, date=2013-06-21, author=(Oliver Burkeman)

, volume=189, issue=2, page=27, magazine=(The Guardian Weekly) , title= The tao of tech , passage=The dirty secret of the internet is that all this distraction and interruption is immensely profitable.

Corrupt, illegal, or improper.

Out of tune.

Of color, discolored by impurities.

(computing) Containing data which need to be written back to a larger memory.

(slang) Carrying illegal drugs among one's possessions or inside of one's bloodstream.

(informal) Used as an intensifier, especially in conjunction with "great".

Sleety; gusty; stormy.

* M. Arnold

Storms of wind, clouds of dust, an angry, dirty sea.

* (Douglas Adams),

Rain type 17 was a dirty blatter battering against his windscreen so hard that it didn't make much odds whether he had his wipers on or off.