The term "most significatory" can be substituted with a number of alternative phrases to convey a similar meaning, including "most meaningful," "most significant," "most important," "most notable," "most influential," and "most consequential." These synonyms all emphasize the idea that something holds great import or weight, and that it carries significant impact or consequences. Choosing an alternative term will depend on the context in which the word is being used, as well as the desired tone and level of emphasis. However, all of these synonymous phrases share a sense of depth and weight that can help to convey the underlying importance and significance of whatever is being described.