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English definition of “ugly”

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ugly

adjective uk   /ˈʌɡ.li/ us  

ugly adjective (NOT ATTRACTIVE)

B1 unpleasant to look at; not attractive: I find a lot of modern architecture very ugly. Yesterday I saw the ugliest baby I've ever seen in my life. I feel really fat and ugly today. He was a really unpleasant man and as ugly as sin (= very ugly).
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ugly adjective (THREATENING)

C2 unpleasant and threatening or violent: There were ugly scenes outside the stadium. The demonstration turned ugly when a group of protesters started to throw bottles at the police.
ugliness
noun [U] uk   /-nəs/ us  
the ugliness of the buildings
(Definition of ugly from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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