ugly as sin

Idioms  

1. 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.

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Example Sentences

It’s a stylistic choice to give the film the essence of a faded vintage photograph, but it’s also ugly as sin.

From Los Angeles Times • Nov. 6, 2025

I used to like Thunderbird but it's ugly as sin.

From The Verge • Nov. 16, 2018

And then there was this broadside — perhaps the closest that one Oval Office aspirant has come in modern times to accusing another of being ugly as sin.

From New York Times • Feb. 27, 2016

Graphical glitches pop up only occasionally, and while human characters are still as ugly as sin, "Two Worlds II" does present convincing monsters and some genuinely beautiful landscapes.

From Seattle Times • Feb. 9, 2011

In life, Ser Myles Toyne had been ugly as sin.

From "A Dance with Dragons" by George R. R. Martin