restricted, confidential, kept quiet, hush-hush*; see secret 1, 2.
"top-secret." YourDictionary, n.d. Web. 09 November 2018. <https://thesaurus.yourdictionary.com/top-secret>.
top-secret. (n.d.). Retrieved November 09th, 2018, from https://thesaurus.yourdictionary.com/top-secret
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