The antonyms for the word "more prizewinning" can be described as the opposite of something that is distinguished as exceptional or superior. The antonyms could be less successful, less distinguished, less superior, less celebrated, or less acclaimed. These antonyms denote the idea that something is not as prizewinning or accomplished as its counterpart. For instance, instead of saying "more prizewinning," one could use the term "less successful" to describe something that is of lower quality or has not been as widely recognized. Other antonyms might include mundane, ordinary, average, mediocre, or unremarkable. Overall, these antonyms describe the idea of not reaching the heights of excellence or recognition typically associated with something that is "more prizewinning.