The word "hexagonal" refers to something that has six sides or angles. If you're looking for synonyms for "most hexagonal," you might try using words like "hexahedral" or "hexangular." Other words that could be used to describe a six-sided shape include "polygonal," "six-sided," or simply "hexagonal" without the "most" qualifier. In a more general sense, you could describe something as "angular," "geometric," or "faceted" if it has a lot of distinct edges or angles. Ultimately, the best synonym will depend on the specific context of the object or concept you're trying to describe.