Open
Open adjective - Not known by only a select few.
Usage example: the two boxers have an open dislike for each other
Undercover is an antonym for open.
Undercover
Undercover adjective - Undertaken or done so as to escape being observed or known by others.
Usage example: an undercover operation to infiltrate the terrorist organization
Both words in one sentence
- In The Incredibles, the government had a team like that, that would come in and wipe memories and implant new ones when an undercover Super would screw up and use his powers in the open.
Source: Memory-Wiping Crew -
An undercover police officer gets kicked in the balls by a shoe with a retractable blade in Don't Open Till Christmas.
Source: Armed Legs - Batman Cold Open: The movie opens with Florence performing an undercover debunking of a fake medium.
Source: Film / The Awakening
Cite this Source
Undercover and Open. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/open/undercover
Open & Undercover. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/open/undercover>.
Undercover or Open. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/open/undercover.
Google Ngram Viewer shows how "open" and "undercover" have occurred on timeline