The editorial said information about the state of the records had been provided "by an unimpeachable source."

Unfortunately, I have been told by unimpeachable sources in the Administration that the press guidance is incorrect.

One needs no unimpeachable sources to guess what could come next.

As an admitted thief, phone hacker, and blagger-of-all-trades, he is obviously not an unimpeachable source.

The description of this 'guy' was superb, bound to stand up in court, coming as it did from such unimpeachable sources.

While you have secondhand reports, I heard the story from an unimpeachable source who was there to see it done.

Wright manufactured details and cited "unimpeachable sources" that said Heirens had confessed.

"I know because I got a message from an unimpeachable source."

Mr. Frost said he had been told "by an unimpeachable source" that the police were out to get his client.

So after that, he made sure that all the information he gathered was all in one unimpeachable source.