very unattractive or unpleasant to look at; offensive to the sense of beauty; displeasing in appearance.

disagreeable; unpleasant; objectionable

ugly tricks; ugly discords.

morally revolting

ugly crime.

threatening trouble or danger

ugly symptoms.

mean; hostile; quarrelsome

an ugly mood; an ugly frame of mind.

(esp. of natural phenomena) unpleasant or dangerous

ugly weather; an ugly sea.

noun

hideousness , unsightliness , monstrosity