The word "cultistic" is used to describe something that is reminiscent of a cult or exhibits cult-like behavior. There are various synonyms for this word, including sectarian, fanatic, extremist, and dogmatic. Other synonyms that might be used to describe similar behavior or beliefs include zealous, indoctrinated, radical, and ideological. These words serve to describe situations where people may be overly invested in a group or ideology and may exhibit behavior that is characteristic of a cult. While these behaviors may not always be negative or harmful, it is important to be aware of the signs of cult behavior and to approach such situations with caution and critical thinking.