secretive

Having a tendency to keep one’s thoughts or activities unknown to others.

Characterized by or done in secrecy.

Suggestive of the keeping of secrets.

Tending to remain concealed. Used of animals.

Tending to secrete or keep secret; given to secrecy or concealment; reticent or reserved concerning one’s own or another’s affairs.

Causing or promoting secretion.

Tending to secrete, or to keep secret or private.

Having an inclination to secrecy.

inclined to secrecy or reticence about divulging information