When it comes to the term "most legalistic," there are a number of synonyms that can be used to describe someone or something. One possible word choice might be "rigidly legalistic," which suggests a focus on strict adherence to legal rules and regulations. Another synonym might be "hyper-legalistic," which conveys an extreme dedication to legalism and a willingness to prioritize legal concerns above all else. Other possibilities might include "ultra-legalistic," "excessively legalistic," or simply "extremely legalistic." Ultimately, the specific synonym chosen will depend on the context and the intended meaning of the term.