Nonconcrete means something that is not tangible or physical, and it can be challenging to describe its opposite with the same level of specificity. However, some antonyms for the phrase "more nonconcrete" include concrete, tangible, physical, palpable, real, and visible. Concrete refers to something that exists in the physical realm and has a definite form and substance. Tangible is used to describe an object that can be touched, felt, or perceived by the senses. Physical describes something that has material substance and occupies space, while palpable refers to a thing that can be felt or touched. Real implies that something is genuine and authentic, and visible means that something can be seen with the naked eye.