not believe a word of it(not) believe a word of it
to not believe that something is true.
Have you heard what they're saying about Andrew? I don't believe a word of it.
not believe a word of it
To doubt every word or aspect of a particular claim or story. Yes, I've heard the story, and I don't believe a word of it—Cheryl is a very reputable businesswoman.My kids told me the vase broke during an earthquake at our house this afternoon. Naturally, I don't believe a word of it.