priviest

I can understand a responsible Liberal minister deciding, ATC, not to open this can, but not without first tipping off the PM and probably not without tipping off the priviest part of the privy council the part that handles national security issues.

Kory Teneycke, meet my tire iron. CC 2008

England, and landed at Dover; and through the wit of Merlin, he had the host northward, the priviest way that could be thought, unto the forest of Bedegraine, and there in a valley he lodged them secretly.

Le Morte d'Arthur: Sir Thomas Malory's book of King Arthur and of his noble knights of the Round table 2003

This, however, is not the place to expatiate on Ormskirk's extraordinary career; his rise from penury and obscurity, tempered indeed by gentle birth, to the priviest secrets of his Majesty's council, -- climbing the peerage step by step, as though that institution had been a garden-ladder, -- may be read of in the history books.

Gallantry Dizain des Fetes Galantes James Branch Cabell 1918

And when he came to the sea he sent home the footmen again, and took no more with him but ten thousand men on horseback, the most part men of arms, and so shipped and passed the sea into England, and landed at Dover; and through the wit of Merlin, he had the host northward, the priviest way that could be thought, unto the forest of Bedegraine, and there in a valley he lodged them secretly.

Le Morte Darthur: Sir Thomas Malory's Book of King Arthur and of his Noble Knights of the Round Table, Volume 1 1903