not a pretty sight

euphemistic humorous sometimes uncountable broadly idiomatic

(euphemistic, sometimes humorous) Something visually unappealing, ranging from mildly unattractive to utterly disgusting in appearance.

Japanese Meaning

見苦しい光景、視覚的に不快な様子。 / 魅力がなく、不快あるいは嫌悪感を抱かせる外観を指す表現。

The aftermath of the storm, with fallen trees and flooded streets, was not a pretty sight.

倒れた木や冠水した通りが残る嵐の後の様子は、見苦しい光景だった。

Sense（1）

(euphemistic, sometimes humorous) Something visually unappealing, ranging from mildly unattractive to utterly disgusting in appearance.

The navvy was certainly not a pretty sight. His muscular arms and legs were all a-sprawl and his head hung back at a strange angle to his body.

Sense（2）

(idiomatic, by extension) Something disappointing, disquieting, disreputable, or otherwise unworthy of admiration.