Secret

Hidden; concealed; as, secret treasure; secret plans; a secret vow.

Withdraw from general intercourse or notice; in retirement or secrecy; secluded.

Faithful to a secret; not inclined to divulge or betray confidence; secretive.

Separate; distinct.

Something studiously concealed; a thing kept from general knowledge; what is not revealed, or not to be revealed.

A thing not discovered; what is unknown or unexplained; a mystery.

The parts which modesty and propriety require to be concealed; the genital organs.

To keep secret.