Close
Close adjective - Given to keeping one's activities hidden from public observation or knowledge.
Usage example: she was as close as a stone when it came to talking about her love life
Undercover and close are semantically related. In some cases you can use "Undercover" instead an adjective "Close".
Undercover
Undercover adjective - Undertaken or done so as to escape being observed or known by others.
Close and undercover are semantically related. Sometimes you can use "Close" instead an adjective "Undercover".
Mutual synonyms
Both words in one sentence
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Good Cop/Bad Cop: Fleming goes undercover and tries to get close to the person under investigation, while Arnott openly investigates as an AC-12 officer.
Source: Series / Line of Duty -
In an episode of Samurai Jack, Jack goes undercover to infiltrate a nightclub with close ties to Aku.
Source: Accidental Dance Craze -
Bounty Hunter: Ventress has become a full-time bounty hunter, and Vos goes undercover as one to get close to her.
Source: Literature / Dark Disciple
Cite this Source
Undercover and Close. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/close/undercover
Close & Undercover. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/close/undercover>.
Undercover or Close. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/close/undercover.
Google Ngram Viewer shows how "close" and "undercover" have occurred on timeline