The phrase "reads someone" can be substituted with numerous synonyms to express the same meaning. "Understands someone" conveys the idea of grasping someone's thoughts and emotions. "Deciphers someone" suggests interpreting someone's demeanor and behavior. "Interprets someone" means analyzing and making sense of someone's words and actions. "Comprehends someone" implies comprehending the meaning behind someone's actions and intentions. "Discerns someone" indicates recognizing and perceiving someone's personality traits and motives. "Senses someone" implies being aware of someone's feelings and emotions. "Infers someone" means deducing and drawing conclusions about someone based on their actions and words. Using these synonyms, one can easily express the idea of "reading" someone in a variety of ways.