Secret
Secret adjective - Undertaken or done so as to escape being observed or known by others.
Unknown is a synonym for secret in confidential topic. In some cases you can use "Unknown" instead the word "Secret" as an adjective or a noun, when it comes to topics like hidden, mysterious, concealed or secret, undisclosed.
Unknown
Unknown adjective - Happening or existing without one's knowledge.
Secret is a synonym for unknown in property topic. You can use "Secret" instead an adjective "Unknown", if it concerns topics such as obscure, mysterious, concealed or secret, undisclosed.
Nearby Words: unknowable, unknowing
Mutual synonyms
Both words in one sentence
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Which is why Kitty's revelation is so effective: Roman only has power, and can strike fear in others, as long as he and his plans remain secret and unknown.
Source: Literature / Kitty Norville -
Sinister for purposes unknown, Nightcrawler is near-comatose after having tried to absorb Thor's power, and the secret to "Mutant Burnout" is still undisclosed.
Source: Comic Book / X-Men Forever -
It meets in secret aboard a warship in deep space, so that its deliberations (and for that matter the identities of its members) remain unknown even to most Minbari.
Source: Secret Circle of Secrets
Cite this Source
Unknown and Secret. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/secret/unknown
Secret & Unknown. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/secret/unknown>.
Unknown or Secret. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/secret/unknown.
Google Ngram Viewer shows how "secret" and "unknown" have occurred on timeline