be (as) ugly as sin

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.
See also: sin, ugly
Farlex Dictionary of Idioms.
See also:
  • (as) ugly as sin
  • as ugly as sin
  • ugly as sin
  • (as) ugly as a toad
  • toad
  • ugly as a toad
  • fugly
  • plug-ugly
  • pug-ugly
  • not a pretty sight