Secret Synonyms
Words/phrases that have a similar definition to the word "secret" include...confidence, skeleton in the cupboard, clandestine, top secret, surreptitious, closet, hush-hush, enigma, sly, cloak-and-dagger, stealthy, riddle, restricted, covert, confidential, furtive, private, surprise, undisclosed, classified, underhanded, mystery, underground
Other words in thesaurus...