The word "un-profoundest" is a negation of the adjective "profound," meaning deep, intense, or insightful. Some synonyms that can be used instead of "un-profoundest" are shallow, superficial, surface-level, simplistic, inadequate, or weak. These words suggest a lack of depth or complexity. "Shallow" means not deep or lacking substance, while "superficial" means concerned only with the obvious or surface details. "Surface-level" describes things that exist on the surface rather than having depth or meaning. "Simplistic" means oversimplified or lacking complexity, and "inadequate" suggests that something is not sufficient or complete. Finally, "weak" means lacking strength or giving in easily.