The man has lied about everything else so I don't know about his credibility.
I have a lot of credibility because I use a reliable sourceHer credibility wasn't a factor in deciding where the money should go.
establish your credibility to write on the topic.
The lawyer's strategy was to attack the credibility of the witness.
The source was not credible.The witness gave a credible account of the events.
One's credibility can be undermined if one is caught lying.
A jury may consider a witness's demeanor on the stand in determining the witness's credibility.
I can give you several sentences.Her credibility as a stock broker is shaky after she lost all that money.Your credibility is too valuable to risk on that crazy stunt.I have to check out his credibility before I hire him.
He did not give credible information to the police.
Nobody questioned her credibility until she went to jail on suspicion of assisting in the theft of several company records.
"She advertised herself as a "Family Counselor", but never having been married, or had any children her credibility in that area was suspect."
Your sentence
Brutus is using ethos in the sentence because he relies on his credibility and reputation to persuade the audience. Ethos involves establishing credibility and trust with the audience, making them more receptive to the speaker's message.