What are the opposite words for more highestquality?

The antonyms for the phrase "more highest quality" can be "lower quality," "inferior," "substandard," "deficient," "mediocre," "poor," "middling," "inferior," "shoddy," and "below par." The concept of quality is an inherent aspect of products and services, and hence, its antonyms are equally important. While the phrase "more highest quality" signifies excellence, premiumness, and top-notch standards, its antonyms denote poor workmanship, unsatisfactory performance, and low-grade results. It is always advisable to use the appropriate antonyms to maintain a balance in communication and avoid any misinterpretation. In conclusion, the opposite of "more highest quality" is a spectrum of substandard quality, ranging from slightly below average to utterly unacceptable.