Adjective
1. not accessible to view;
"concealed (or hidden) damage""in stormy weather the stars are out of sight"2. covered from view;
"her face buried (or hidden) in her hands""a secret buried deep within herself"3. designed to elude detection;
"a hidden room or place of concealment such as a priest hole""a secret passage""the secret compartment in the desk"4. difficult to find;
"hidden valleys""a hidden cave""an obscure retreat"