as ugly as sin

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(as) ugly as sin

Extremely visually displeasing or unattractive. This old car is all beat up and ugly as sin, but it's still going strong after all these years. I'm sure I looked as ugly as sin by that point, with my makeup smeared all over the place and my hair a total mess.
See also: sin, ugly

(as) ugly as sin

mod. very ugly. This car’s as ugly as sin, but it’s cheap and dependable.
See also: sin, ugly