be (as) ugly as sin

To be extremely visually displeasing or unattractive. I wouldn't buy that painting, it's ugly as sin. I heard the date didn't go well and that the guy was as ugly as sin. Well, this wallpaper obviously has to go—it's ugly as sin!

See also: sin, ugly

See also:

(as) ugly as sin
as ugly as sin
ugly as sin
awfully
be fugly as sin
fugly
fugly as sin
(as) ugly as a toad
ugly as a toad
plug-ugly

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