Clandestine
Clandestine adjective - Undertaken or done so as to escape being observed or known by others.
Usage example: I took a clandestine peek at the price tag on the diamond necklace
Open is an antonym for clandestine.
Open
Open adjective - Not known by only a select few.
Usage example: the two boxers have an open dislike for each other
Clandestine is an antonym for open.
Both words in one sentence
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Stealth Hi/Bye: During Temoc's clandestine meetings with Caleb, Temoc has a tendency to suddenly disappear when Caleb's back is turned, often leaving an open window in his wake.
Source: Literature / Two Serpents Rise -
Open Secret: Throughout the Hitman series, the International Contract Agency had been portrayed as an extremely secret clandestine organisation, connected to most major nations' secret services and the UN, only every operating through proxies' proxies.
Source: Video Game / Hitman -
Open Secret: Throughout the Hitman series, the International Contract Agency had been protrayed as an extremely secret clandestine organisation, connected to most major nations' secret services and the UN, only ever operating through proxies' proxies.
Source: Video Game / Hitman: Absolution
Cite this Source
Open and Clandestine. (2016). Retrieved 2026, August 18, from https://thesaurus.plus/related/clandestine/open
Clandestine & Open. N.p., 2016. Web. 18 Aug. 2026. <https://thesaurus.plus/related/clandestine/open>.
Open or Clandestine. 2016. Accessed August 18, 2026. https://thesaurus.plus/related/clandestine/open.
Google Ngram Viewer shows how "clandestine" and "open" have occurred on timeline