The word "un-concealed" means to reveal or to make something known. Its antonyms would be words that describe being hidden, undisclosed or covered up. These include words such as concealed, hidden, camouflaged, masked, obscured, buried, veiled, secret, undisclosed, and obscured. These words describe the opposite of "un-concealed" and are often used to indicate something that is not visible or known to the general public. For example, a hidden treasure might be concealed in a secret place that is not known to anyone. Similarly, a masked identity or a veiled threat can often be concealed in plain sight.