The term "uncomprehending" refers to a state of confusion or lack of understanding. Opposite to it, the antonyms that can be used to describe someone who is aware and has complete understanding are words like comprehending, aware, understanding, cognizant, perceptive, savvy, astute, apprised and enlightened. A person who is comprehending has the ability to grasp concepts and understand them fully. Being cognizant means to have knowledge or awareness about a situation. And being enlightened implies having a clear and deeper understanding of something. In conclusion, the antonyms for "uncomprehending" signify a state of being aware, intelligent and perceptive.