The phrase "most tribal" can be substituted with other words and phrases to convey a similar meaning. Some synonyms include "rawest," "primal," "traditional," "ethnic," and "indigenous." Other possible options might include "unrefined," "tribalistic," "clannish," or "endemic." Each of these words might be useful in different contexts, depending on the nuance and tone that the writer or speaker wishes to achieve. Ultimately, the choice of synonym will depend on the specific sentence and the intended audience, as well as the intent of the communication itself.