Private
Private adjective - Not known or meant to be known by the general populace.
Usage example: that he is planning to retire is private information until he makes a public announcement
Underground is a synonym for private. In some cases you can use "Underground" instead an adjective "Private".
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
Private is a synonym for underground in secret topic. Sometimes you can use "Private" instead an adjective "Underground", if it concerns topics such as clandestine.
Mutual synonyms
Related pairs
- confidential and private
- confidential and underground
- secluded and private
- secluded and underground
- privy and private
- privy and underground
- secret and private
- secret and underground
- classified and private
- classified and underground
- arcane and private
- arcane and underground
- concealed and private
- concealed and underground
How words are described
Both words in one sentence
- Underground has this one level which has you infiltrating Himmler's private castle and being attacked by Nazi knights.
Source: Hell Is That Noise / Video Games -
The underground comic "Dopin' Dan" has a strip where the title Army private is being run through a typical bureaucratic procedure, but the girl at the desk can't find his papers.
Source: Un-Person -
Whether in private quarters, underground power plants or moon-sized killer space stations, expect to see a lot of these.
Source: Franchise / Star Wars
Cite this Source
Underground and Private. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/private/underground
Private & Underground. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/private/underground>.
Underground or Private. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/private/underground.
Google Ngram Viewer shows how "private" and "underground" have occurred on timeline