Top-secret
Top-secret adjective - The highest official level of classification of documents.
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Synonyms for Top-secret
Underground and top-secret are semantically related. In some cases you can use "Underground" instead an adjective phrase "Top-secret".
Underground
Underground adjective - Undertaken or done so as to escape being observed or known by others.
Top-secret and underground are semantically related. Sometimes you can use "Top-secret" instead an adjective "Underground".
Mutual synonyms
Related pairs
- confidential and top-secret
- confidential and underground
- private and top-secret
- private and underground
- secret and top-secret
- secret and underground
- classified and top-secret
- classified and underground
- arcane and top-secret
- arcane and underground
- sneaky and top-secret
- sneaky and underground
- hidden and top-secret
- hidden and underground
Both words in one sentence
- Justified as their complex is a top-secret Elaborate Underground Base and they don't want anything escaping.
Source: Sigil Spam / Video Games -
Big to have a top-secret underground cave-system headquarters, but most Bond villains do, so why not?
Source: Film / Live and Let Die - An Updated Re-release, Alien Shooter: Revisited, was also released in 2009, featuring more levels and an extra game mode.Here's the lowdown: A top-secret Elaborate Underground Base has been infested with hostile alien creatures.
Source: Video Game / Alien Shooter
Cite this Source
Underground and Top-secret. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/top-secret/underground
Top-secret & Underground. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/top-secret/underground>.
Underground or Top-secret. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/top-secret/underground.
