The phrase "more nonmaterial" refers to things that are intangible, abstract, or not physical in nature. Antonyms for this phrase would include words like material, concrete, physical, tangible, and objective. These antonyms describe things that can be touched, seen, heard, or touched - physical objects that have a form and substance. While nonmaterial things might be ideas, emotions, or concepts, material things are the things that we can hold in our hands, like books, toys, or food. Concrete and tangible things are objective and can be measured or observed, whereas nonmaterial things are more subjective and can vary from person to person.