Dualism refers to the concept of two contrasting, often opposite entities. Antonyms for the phrase "most dualistic" could include "harmonious," "unified," or "monistic." These words suggest a cohesive, singular entity rather than emphasizing the duality within a system. Alternatively, "blended," "mixed," or "intermingled" could also serve as antonyms, indicating the merging of opposing forces rather than their separateness. Other antonyms might include "inclusive," "comprehensive," or "holistic," which suggest a more all-encompassing and interconnected view of things. Overall, choosing an antonym for "most dualistic" will depend on the specific context and intended meaning.