(as) ugly as sin

(as) ugly as sin

Extremely visually displeasing or unattractive. I wouldn't buy that painting, it's as ugly as sin. I'm sure I looked ugly as sin, with my makeup smeared all over and my hair a total mess.
See also: sin, ugly

*ugly as sin

Cliché extremely ugly. (*Also: as ~.) Why would anyone want to buy that dress? It's as ugly as sin! Harold is ugly as sin, but his personality is very charming.
See also: sin, ugly

ugly as sin

Physically or morally hideous, as in I can't think why she likes that dog; it's ugly as sin. This simile, first recorded in 1801, replaced the earlier ugly as the devil.
See also: sin, ugly

ugly as sin

If someone or something is as ugly as sin, they are very ugly. Even his kids were ugly as sin.
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

ugly as sin

verb
See also: sin, ugly