There are several synonyms for the phrase "is impressive." One option is "is remarkable," which implies that something is worthy of attention or admiration. Another synonym for "is impressive" is "is astounding," suggesting that something is extremely surprising or unexpected. "Is noteworthy" is another alternative that emphasizes the importance or significance of a particular attribute or achievement. Additionally, "is notable" emphasizes the uniqueness or distinctiveness of a quality or skill. Finally, "is awe-inspiring" emphasizes the emotional impact of something that is truly impressive and awe-inspiring. All of these synonyms convey the idea that something is worthy of admiration or attention due to its exceptional qualities or achievements.