ugly as sin

Adjective

not-comparable

(simile) Extremely ugly.

Japanese Meaning

信じられないほど醜い / 非常に醜い

The abandoned house looked ugly as sin, yet the real estate agent insisted it had potential.

その廃屋は非常に醜かったが、不動産業者はまだ可能性があると主張した。

Sense（1）

(simile) Extremely ugly.

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