Dark
Dark adjective - Being without light or without much light.
Top secret and dark are semantically related. In some cases you can use "Top secret" instead an adjective "Dark".
Top secret
Dark and top secret are semantically related. Sometimes you can use "Dark" instead an adjective phrase "Top secret".
Mutual synonyms
Both terms in one sentence
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Mass Effect: Vigil tells Shepard's party that the Prothean research facility on Illos survived because it was top secret and went completely dark when the Reapers began their invasion.
Source: Black Site - The story follows Eliot Shakman and Evelyn Graham, interns of a top secret paranormal investigation agency, as they go on missions to patrol the city for dangerous supernatural entities and unathorized magic users.Provides examples of: Badass Longcoat: Eliot always wears a long, dark trenchcoat.
Source: Webcomic / Root Rot -
It might have been closed off long ago (since it houses a Dark Secret) or it's still being used by the Beyond Top Secret club.
Source: Missing Floor
Cite this Source
Top secret and Dark. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/dark/top_secret
Dark & Top secret. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/dark/top_secret>.
Top secret or Dark. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/dark/top_secret.
Google Ngram Viewer shows how "dark" and "top secret" have occurred on timeline