The word "subtilizes" means to refine or improve something, to make it more subtle or delicate. Some possible synonyms for "subtilizes" are "refines," "fine-tunes," "polishes," "perfects," "hones," "enhances," "elevates," "deepens," "heightens," "finesse," "cultivates," "develops," "amplifies," "sharpens," "clarifies," "subdues," "subtles," and "grooms." These words all suggest a process of improvement or refinement that brings out the best in something and makes it more refined, sophisticated, or nuanced. Whether you are refining a skill, a product, or a message, the act of subtilizing involves a careful and deliberate process of honing and polishing until you achieve the desired effect.