The word "impressive" describes an accomplishment that you think is good, which not many people are able to do.

You were able to cook all that in less than an hour? That's impressive!

You can use "impressive" to sincerely praise someone. It's a little formal.

"Impressive" is usually used to describe the things that people have done, rather than the people themselves. Some common words that "impressive" is used with are:

• an impressive performance
• an impressive list of achievements
• impressive results