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.

Common Names:

Name	Pronounced	Usage
Celio	CHE-lyo (Italian), THE-lyo (Spanish), SE-lyo (Latin American Spanish), SE-lyoo (Portuguese)	Italian, Spanish, Portuguese
Gardenia	gahr-DEEN-yə	English (Rare)
Zurab	-	Georgian
Meyer	-	Hebrew
Jarl	YAHRL (Norwegian, Swedish, Danish)	Norwegian, Swedish, Danish, Norse Mythology, Ancient Scandinavian
Berna	-	Turkish