Antonyms for the term "more unimpressive" could include several words such as remarkable, impressive, awesome, superb, or extraordinary. These words describe things that stand out or exceed expectations, the complete opposite of something unimpressive. Additionally, terms like spectacular, exceptional, phenomenal, and outstanding further illustrate the qualities of something that is not unimpressive. Conversely, words such as average, commonplace, or ordinary could also be used as antonyms to "more unimpressive" to describe things that do not stand out or exceed expectations. Overall, antonyms to "more unimpressive" describe things that are worthy of recognition, excitement, and admiration.