Here's why:
* Credibility refers to the quality of being believable or trustworthy. It's the abstract concept behind the adjective "believable".
Here are some examples of how to use "credibility" in a sentence:
* The witness's testimony lacked credibility due to inconsistencies in her story.
* The company's credibility was damaged by the recent scandal.
* The new president's speeches were designed to enhance his credibility with the public.