The word "disquisitional" refers to something that is marked by a thorough and prolonged discussion. Some synonyms for the phrase "most disquisitional" include comprehensive, exhaustive, detailed, meticulous, and thorough. These words all suggest a level of thoroughness and attention to detail that is in line with the meaning of "disquisitional." Other potential synonyms for this phrase might include analytical, in-depth, and scholarly, although these words may carry slightly different connotations depending on the context in which they are used. Ultimately, the choice of synonym will depend on the specific tone and meaning the writer intends to convey.