Most apprehensible refers to something that is easily understandable or comprehensible. Its antonym, therefore, would be the opposite - something that is not easily understood. Some antonyms for most apprehensible could include incomprehensible, inscrutable, baffling, elusive, unintelligible, or obscure. These words suggest a level of complexity or difficulty that makes it challenging for people to grasp or comprehend the subject matter. Thus, if something is not apprehensible, it requires more effort, skill, or knowledge to understand. In contrast, something that is most apprehensible is simple, clear, and straightforward. Understanding the antonyms for most apprehensible can help individuals communicate more effectively, especially when presenting complex or abstract ideas.