1. superlative form of privy; most private, secret, or confidential
Usage: formal or archaic; often used in the phrase 'privy to' meaning having secret knowledge of

Examples

• She was the priviest advisor to the king, trusted with his most sensitive decisions.
• Only the priviest members of the council were informed of the plan.
• He felt honored to be made privy to such priviest matters of state.
• The priviest details of the negotiation were kept from the public.
• Among all the officials, she held the priviest position in the government.