ugly as sin

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ugly as sin (not comparable)

1. (simile) Extremely ugly.
   • 1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 298:

     It was easy enough to see that the child was a changeling, for it wasn't like other children at all it screamed and cried, as if a knife stuck in it, and it wheezed and hit about with its arms like a huldre-cat, and was as ugly as sin.

   • 1934, Agatha Christie, chapter 3, in Murder on the Orient Express, London: HarperCollins, published 2017, page 26:

     'She is a personality,' said M. Bouc. 'Ugly as sin, but she makes herself felt.'.

• like the back end of a bus
• See also Thesaurus:ugly

• original as sin