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
Leia	LAY-a (Popular Culture)	Biblical Greek, Popular Culture
Haldor	-	Norwegian
Ezekias	-	Biblical Greek
Thanh	TUNG, TUN	Vietnamese
Nerida	-	Indigenous Australian
Arielle	ar-ee-EL	French