The term "depthless" means lacking depth, profoundness, or complexity. The antonyms for "more depthless" would be terms that describe depth, profundity, or complexity. Some of the antonyms for "more depthless" could be profound, deep, insightful, complex, intricate, or complicated. These words highlight the complexity and richness that is missing in something that is "depthless." They suggest that there is more to be explored, studied, and understood in the subject matter, and that it is worth taking the time and effort to delve deeper into. Using antonyms like these can help to bring more nuance and depth to our conversations and written work.