The antonyms for the word "un-apprehended" are quite straightforward. The word "apprehended" means to be caught or taken into custody, so the opposite of that would be "unapprehended" meaning not caught or not taken into custody. The antonyms for "unapprehended" would be "apprehended," "caught," "arrested," "seized," "nabbed," "captured," "detained," "collared," or "taken into custody." These words all describe the opposite meaning of "unapprehended." Whether we are referring to a criminal or a missing person, the antonyms of "unapprehended" clarify that the persons have been apprehended or found.