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
Thomson	['tɔmsn]
Romolo	RO-mo-lo	Italian
Kailash	-	Indian, Hindi, Marathi
CibrÁN	thee-BRAN	Galician
Mudiwa	-	Southern African, Shona
Martin	MAHR-tən (English), mar-TEN (French), MAHR-teen (German, Finnish), MAHR-tin (Swedish, Norwegian, Danish), MAWR-teen (Hungarian), mahr-TIN (Bulgarian)	English, French, German, Swedish, Norwegian, Danish, Russian, Romanian, Czech, Slovak, Slovene, Croa