Displeasing to the eye; not aesthetically pleasing.
Displeasing to the ear or some other sense.
Offensive to one's sensibilities or morality.
He played an ugly trick on us.
Ill-natured; crossgrained; quarrelsome.
an ugly temper; to feel ugly
Unpleasant; disagreeable; likely to cause trouble or loss.
With all this competition, expect things to get ugly.