incredible

Too implausible to be credible; beyond belief.

The extinction of a species once so numerous seemed incredible.

I get lost in what is credible and not credible. This whole thing gets so incredible when you consider wiping out whole nations, it is difficult to establish credibility.

Amazing; astonishing; awe-inspiring.

He was so wrapped up in watching the incredible special effects that he couldn't keep track of the story.

Marvellous; profoundly affecting; wonderful; excellent.

I had such an incredible slice of pizza last night that I simply can't think about anything else.