The word "most retiary" means the most intricate or complex. Antonyms for this word would be simple, uncomplicated, straightforward, plain, easy, and effortless. If something is simple, it is not difficult to comprehend, and it does not involve many steps or processes. Uncomplicated refers to something that is not complex or difficult to deal with. Straightforward implies something that is not complicated or confused, free from ambiguity, and easy to understand. Plain is the opposite of intricate or ornate, indicating something that is ordinary, unadorned, and lacking complexity. Effortless implies something that is not difficult to accomplish, requiring little or no exertion or energy.