Covert

1. adjective

   secret or hidden; not openly practiced or engaged in or shown or avowed

   “covert actions by the CIA”

2. noun

   a covering that serves to conceal or shelter something

   “a screen of trees afforded privacy”

   Similar: screen, cover, concealment

3. adjective

   (of a wife) being under the protection of her husband

   “a woman covert”

4. noun

   a flock of coots