Un-sightlinesses refer to things or objects that are unattractive or displeasing to the eyes. Their antonyms, therefore, would be words that indicate beauty, attractiveness or pleasing appearance. Some of the antonyms for un-sightlinesses include beauty, elegance, attractiveness, grace, loveliness, comeliness, charm, and gorgeousness. These words signify positive attributes and qualities that appeal to the senses and evoke pleasant or positive feelings. In general, antonyms for un-sightlinesses denote things that are visually pleasing and attractive, which is why they are often used to describe people, places, or objects that are visually appealing or picturesque.