Mishnical is an adjective that describes someone who is overly strict and legalistic in their adherence to rules and regulations. There are several synonyms that can be used to describe someone with this type of mindset. One word that could be used is pedantic, which refers to someone who is overly concerned with minor details and rules. Another word that could be used is nitpicky, which describes someone who is overly critical and focused on small things. Other synonyms for mishnical include legalistic, rigid, dogmatic, doctrinaire, and inflexible. When describing someone with these traits, it is important to use the appropriate synonym that accurately portrays their behavior and beliefs.