ugly as a toad
(as) ugly as a toad
Extremely unattractive or visually displeasing. A: "Why would anyone want to date me? I'm as ugly as a toad!" B: "Hey, now, that's just not true! Plus, you're an incredibly smart, funny, and sweet person!" Everyone keeps hailing the building's design as some innovative and daring artistic statement, but I think it looks ugly as a toad.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*ugly as a toad
[of a living creature] very ugly. (*Also:as ~.) Maria may be a beautiful woman, but when she was a child she was as ugly as a toad. The shopkeeper was ugly as a toad, but he was kind and generous, and everyone loved him.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.