Hidden
Hidden adjective - Screened or sequestered from view.
Underground is a synonym for hidden in unseen topic. In some cases you can use "Underground" instead an adjective "Hidden".
Underground
Underground adjective - Undertaken or done so as to escape being observed or known by others.
Usage example: an underground operation to smuggle ancient artifacts out of the country
Hidden is a synonym for underground in secret topic. You can use "Hidden" instead an adjective "Underground", if it concerns topics such as clandestine.
Mutual synonyms
Related pairs
- buried and hidden
- buried and underground
- secluded and hidden
- secluded and underground
- private and hidden
- private and underground
- secret and hidden
- secret and underground
- sneaky and hidden
- sneaky and underground
- concealed and hidden
- concealed and underground
- covered and hidden
- covered and underground
Both words in one sentence
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Buried City: This was once a thriving surface city that has come to ruin, but also been hidden and preserved to an amazing level underground.
Source: Underground City -
In Raiders of the Lost Ark, Belloq leaves Indiana Jones trapped inside the Well of Souls, the underground temple where the Ark was hidden.
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Masquerade: Pokeumans and Pokextinction live in societies hidden from humans, hiding in underground bases and erasing the memories of anybody unfortinate enough to discover the secret.
Source: Fanfic / Pokeumans
Cite this Source
Underground and Hidden. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/hidden/underground
Hidden & Underground. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/hidden/underground>.
Underground or Hidden. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/hidden/underground.
Google Ngram Viewer shows how "hidden" and "underground" have occurred on timeline