There are various ways to describe that someone is in another person's good books. They may be considered "in favor", "well-liked", "highly regarded", or simply "on good terms". Other synonyms include "in good standing", "in the good graces", "favorable status", "held in esteem", and "in good favor". These terms all indicate a positive relationship between the two parties involved, with one person holding a favorable opinion or feeling towards the other. Whether in a personal or professional setting, being in someone's good books can lead to better communication and connections, opportunities, and a more positive experience overall.