ugly as sin

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(as) ugly as sin

Extremely visually displeasing or unattractive. This old car is all beat up and ugly as sin, but it's still going strong after all these years. I'm sure I looked as ugly as sin by that point, with my makeup smeared all over the place and my hair a total mess.
See also: sin, ugly
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

*ugly as sin

Cliché extremely ugly. (*Also: as ~.) Why would anyone want to buy that dress? It's as ugly as sin! Harold is ugly as sin, but his personality is very charming.
See also: sin, ugly
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

ugly as sin

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.
See also: sin, ugly
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ugly as sin

If someone or something is as ugly as sin, they are very ugly. Even his kids were ugly as sin.
See also: sin, ugly
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

(as) miserable/ugly as ˈsin

(spoken) used to emphasize that somebody is very unhappy or ugly: He arrived at the party looking as miserable as sin. ♢ Some babies are as ugly as sin at that age.
See also: miserable, sin, ugly
Farlex Partner Idioms Dictionary © Farlex 2017

ugly as sin

verb
See as ugly as sin
See also: sin, ugly
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

ugly as sin

Hideous, either physically or spiritually. This simile appears to have replaced the earlier ugly as the devil, mentioned by Daniel Defoe in his History of the Devil (1726). The first appearance in print was in Maria Edgeworth’s Popular Tales of 1804: “Why, she is ugly as sin!”
See also: sin, ugly
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
It was the size and weight of a brick, ugly as sin and stopped working after a week.
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The magazine described the cheap-to-run G-Wiz, which ended production in 2012, as "slow, not very safe and ugly as sin".
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After declaring in a blog post that GOPer Marilinda Garcia (with misspellings corrected), is "one of the most attractive women on the political scene anywhere, not so attractive as to be intimidating, but truly attractive," he went on to rant about the looks of Dem incumbent Annie Kuster, who he called "ugly as sin" (and for an added touch, added that he hoped he hadn't "offended sin").
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Of course, they'd have to go and watch another game because my lads are as ugly as sin."
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on the coal When she's bevied she's really a shocker She got a few bob when she left her last job Made redundant when she was a Docker She got 22 grand cash in her hand But even with that lump sum She does nothing but cry Cos hard as they try The doctors just can't fix her Hump I say, "Look so yer fat, well never mind "You're the one girl, I'll never ditch "With yer black toothy grin, yer ugly as sin "But let's face it, yer bloody well rich!" by Bobby Clinton, L5
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An American radio vet who believes she's as ugly as sin gets a call from an English photographer with a troublesome dog.
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"Some people think it's ugly as sin, other people think it's good looking on the line.
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I am positive there is no living Southern feminist worth a hoot who didn't spend a good chunk of her adolescence acting ugly as sin. It does get in your blood.
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