The term "more simplex" refers to something that is simple or uncomplicated. Some possible antonyms, or words with opposite meanings, include complex, intricate, difficult, or convoluted. These words suggest something that is multifaceted, intricate, and requires a great deal of effort to understand. Alternatively, the word "more complex" might suggest something that is simple, straightforward, or easy to comprehend. Other potential antonyms for "more simplex" might include compound, elaborate, or sophisticated. These words suggest ideas of complexity and advanced thinking or design, and contrast with the simple and straightforward quality of something that is "more simplex.