Because very little can be believed: Iarnrod Eireann is now a company with near zero credibility.

The Rigged Witch Hunt has zero credibility.

There were no papers published from the sceptical viewpoint, which would suggest zero credibility for Mr Waghorne's position.

There is zero credibility in offering a moratorium on missiles they are already deploying, Stoltenberg told a news conference.

David Lidington, a Conservative and the government's minister for Europe, said Labor had " zero credibility on standing up for Britain in Europe".

Karan Bilimoria, the founder of Cobra beer and Remain backer, said the prime minister had " zero credibility" and that Britain could now rethink leaving.

Omarosa had Zero credibility with the Media (they didn't want interviews) when she worked in the White House.