The term 'most nontransparent' refers to an object or scenario that is difficult to understand or lacks clarity. Some of the antonyms for this phrase include words like lucid, transparent, clear, unambiguous, and straightforward. When something is described as lucid, it suggests that it is easily comprehensible, and its meaning is apparent. Alternatively, a transparent object is one that allows light or objects to pass through it clearly without much distortion. Similarly, if something is considered unambiguous, it lacks confusion, and its meaning is easy to grasp. In summary, to provide an antonym to 'most nontransparent,' one would need to use words that indicate clarity, simplicity, and straightforwardness.