The word "un-comprehensible" means difficult or impossible to understand. The antonyms for this word are clear, comprehensible, and intelligible. When something is clear, it is easy to understand and free from confusion or ambiguity. Comprehensible means something that can be understood, that is clear and easy to grasp. Intelligible, on the other hand, means something that is clear enough to be understood by someone who is conversant with the subject. These words not only provide an opposite meaning to "un-comprehensible," but also add clarity to language and help ensure effective communication.