The word "discovered" means to find or uncover something for the first time. Some antonyms for this term could include concealed, hidden, or covered up. These words suggest that the object or information in question is not easily accessible or visible. Other antonyms might include obscured, veiled, or withheld, which imply that the discovery has been purposely kept from view. Alternatively, antonyms such as lost, forgotten or abandoned may suggest that the object or information was once known or present, but has since been misplaced or disappeared altogether. Overall, the antonyms for "discovered" emphasize the idea of something being inaccessible, unknown or hidden.