Concealed

Hidden; kept from sight; secreted.

-- Con·ceal·ed·ly , adv. -- Con·ceal·ed·ness, n.

Concealed weapons (Law), dangerous weapons so carried on the person as to be knowingly or willfully concealed from sight, -- a practice forbidden by statute.

Definition: hidden, secret
Antonyms: bare, clear, disclosed, exposed, obvious, open, plain, revealed, shown, told, uncovered

Said of materials, components, controls, etc., that are rendered inaccessible by the finish or structure of a building.