The term "most rabbinical" can be synonymous with several other words or phrases, depending on the context. One possible alternative is "most religiously conservative," which conveys a similar sense of adherence to traditional Jewish customs and beliefs. Another option might be "most Talmudic," which implies a deep knowledge and adherence to the scriptures and teachings of the Jewish religious text. "Most orthodox" is also a possible synonym, indicating a strong commitment to established religious practices and beliefs. Ultimately, the choice of term will depend on the specific context and intended meaning.