cred·i·bil·i·ty 
/ˌkrɛdəˈbɪləti/ noun
/ˌkrɛdəˈbɪləti/ noun [noncount] : the quality of being believed or accepted as true, real, or honest
▪ The new evidence lends credibility to their theory. ▪ a lack/loss of credibility ▪ The scandal undermined/damaged her credibility as an honest politician. ▪ In this instance, the lawyer's job is to make the jury doubt/question the witness's credibility. ▪ They doubted the credibility of the witness's story. [=they doubted that the story was true]
▪ The new evidence lends credibility to their theory. ▪ a lack/loss of credibility ▪ The scandal undermined/damaged her credibility as an honest politician. ▪ In this instance, the lawyer's job is to make the jury doubt/question the witness's credibility. ▪ They doubted the credibility of the witness's story. [=they doubted that the story was true]
