secret ˈsiːkrɪt/ Noun Something that is kept or meant to be kept unknown or unseen by others. synonyms: confidential, restricted, unrevealed, undisclosed, unpublished, untold, unknown, uncommunicated, behind someone's back, under wraps, unofficial, off the record, not for publication/circulation, not to be made public, not to be disclosed April Sawyer was fully aware of the danger of keeping a secret, but she was willing to give her life to keep it to herself.