Incredible means so extraordinary or amazing that it's hard to believe. When something is incredible, it goes beyond what seems possible or normal: an incredible sunset might fill the entire sky with colors you've never seen before, or an incredible gymnast might perform moves that look like they defy gravity.

We usually use this word in a positive way. An incredible story could be so exciting and surprising that you can barely believe it happened. An incredible achievement might be something that seems impossible until someone actually does it, like climbing Mount Everest or solving a math problem that stumped experts for years.

You might hear someone describe an incredible meal, an incredible concert, or an incredible book. In each case, they mean it was so good it exceeded their expectations dramatically. When your teacher says you did an incredible job on a project, she means you went far beyond what she expected and created something truly impressive.

The opposite of incredible is credible, which means believable or trustworthy. Something credible makes sense and seems realistic, while something incredible amazes you precisely because it pushes past ordinary boundaries.