secretive

The military has been trying to stop current and former special operators from discussing their secretive profession.

They dislike cell phones and they are, for various practical reasons, somewhat secretive.

The mayor responded defiantly with a kind of military pageant that was truly bizarre for such a secretive organization.

The Long Range Strike Bomber may be the most secretive Pentagon aviation program in decades.

Even the arguably more secretive National Security Agency took the Twitter plunge last December.

How could she be at the same time both cruel and tender, both true and false, frank and secretive, spiritual and sensual?

He was a secretive man who shared no secrets with his neighbors if he could help it, yet whose very idiosyncrasies betrayed them.

He was still in no hurry, but he grew cautious now, and secretive.

Some of the tribes are very secretive and stealthy in their movements.

If a child finds that no one will speak to it about sexual matters, it must ultimately become secretive about its own sexual life.