The phrase "more cutting-edge" suggests innovation, advancement, and sophistication. To express the opposite idea, one could use the following antonyms: obsolete, outdated, antiquated, archaic, ancient, primitive, backward, and old-fashioned. These terms signify a lack of progress, development or modernization. They imply that something is no longer relevant or useful due to technological or cultural advancements. Using these antonyms, one could convey the idea of something being behind the times, out-of-date, or unrefined. In comparison to "more cutting-edge," these antonyms highlight a lack of novelty or improvement.