ugly as sin

Something that is so disgustingly hideous it is comparable to sin itself, not necessarily physically ugly, something so disturbingly ugly it makes your stomach churn.

Synonyms for ugly as sin

On this page, you will find 30 slang terms related to ugly as sin. Some of the top words include: fugly, sloppy, Homestar Runner, Seedy, raunchy, and 25 more.