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A secret password. Secret, covert, stealthy, furtive, clandestine, surreptitious, underhanded mean done without attracting observation. See examples of secret used in a sentence. Find the best product for your odor protection needs at secret. com. Learn about secret deodorants and antiperspirants. A piece of information that is only known by one person or a few people and should not be told…. Kept from general knowledge: Secret implies … Done, made, or conducted without the knowledge of others.