not a pretty sight noun2 •(humorous, euphemistic) 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. — 1890 •Something disappointing, disquieting, disreputable, or otherwise unworthy of admiration.Her lover, cheek by jowl with Maria, at the head of that army of Portuguese ragamuffins, was not a pretty sight. — 1909
