"Squintest" is a rare word, which means to squint in a more exaggerated or intense way. There are several synonyms that can be used instead of "squintest," such as glare, scowl, frown, grimace, glare, and glower. When someone is squinting, they may be experiencing discomfort from bright light or trying to see something more clearly, but when they squint harder, it can convey displeasure or annoyance. Using synonyms can help to make writing more dynamic and expressive, enabling writers to convey a more precise or nuanced meaning to their readers. By employing synonyms for "squintest," writers can convey a range of emotions and attitudes in their prose, from determination and concentration to frustration or anger.