Incredible means unbelievable: “His claim that he would stand first in the class seems to be incredible since his performance in the previous years has been very mediocre.”
Incredulous means unbelieving: “He gave me an incredulous look when I told him that I could recall ghosts.”
Incredible & Incredulous
![](https://wordpandit.com/wp-content/uploads/2012/06/9.-Usage-Tips.png)