(to be) (as) ugly as sin informal simile
Extremely ugly; unlovely; unattractive
I don’t know why my mom bought that bag. It is as ugly as sin.
Though his appearance is ugly as sin, my friends still likes him due to his kind and generous character.
I hate frogs because they’re ugly as sin.
A derogatory term indicates that a person whose hair is red and considered unattractive.
An ugly woman with an attractive body.
Very ugly
Extremely ugly.