"Look askance" and "look sidelong" are synonyms for the phrase "look asquint." All of these terms mean to look at something with suspicion or skepticism, often with one eye partially closed or turned to the side. Other related synonyms include "cast a sidelong glance," "give the eye," and "squint." These words can all be used to describe someone who is observing a situation or person with a wary or untrusting gaze. "Look askance" is perhaps the most commonly used of the synonyms, but "look asquint" and "look sidelong" can both be employed to add variation to your writing.