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ugly as sin

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Physically or morally hideous, as in I can't think why she likes that dog; it's ugly as sin. This simile, first recorded in 1801, replaced the earlier ugly as the devil.

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We understand! Words are tricky that way. Take this quiz on the Words of the Day from February, 2021, to show that you’re far from frumious!
Question 1 of 10
Which Word of the Day means “happening within or being the created world of a story”?
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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