privy 1
privately aware [of], secretly knowledgeable [about]
2H6 III.i.47 [Suffolk to Queen, of Gloucester and the Duchess's practices] if he were not privy to those faults
AC I.ii.42 [Alexas to Charmian] You think none but your sheets are privy to your wishes
Ham I.i.134 [Horatio to Ghost] If thou art privy to thy country's fate
RJ V.iii.266 [Friar to Prince, of Juliet] to the marriage / Her nurse is privy
TG III.i.12 [Proteus to Duke] Myself am one made privy to the plot