However, you can create words with similar meanings by using prefixes like:
* Un-: Unimpressive (meaning not impressive)
* Over-: Overimpressive (meaning excessively impressive)
* Highly-: Highly impressive (meaning extremely impressive)
* Most-: Most impressive (meaning the most impressive)
Remember, these are just a few examples, and the specific prefix you choose will depend on the context and the nuance you want to convey.