The term "more hypersonic" implies something that is faster than supersonic speed. However, there are several antonyms for this term, which refer to something slower or less fast. Some of the antonyms for "more hypersonic" include subsonic, which refers to a speed that is slower than the speed of sound, supersonic, which refers to a speed that is equal to or greater than the speed of sound, and transonic, which refers to a range of speeds that are close to the speed of sound. Other antonyms for "more hypersonic" might include words like gradual, slow, or measured, all of which imply a pace that is leisurely or deliberate, rather than swift or speedy.