"Beady eye" is a phrase that is commonly used to describe someone who is watchful or suspicious. It is said that people with beady eyes tend to be shrewd or cunning. There are many different synonyms for the phrase "beady eye" that have similar connotations. Words like "shifty," "sneaky," and "sly" all describe someone who is always on the lookout for trouble. "Sharp-eyed," "observant," and "keen" all describe someone who is constantly watching their surroundings. These synonyms can be used interchangeably with "beady eye" to describe someone with a watchful gaze.