Synonyms of clandestine

clandestine

adjective

klan-ˈde-stən 

as in undercover

undertaken or done so as to escape being observed or known by others

I took a clandestine peek at the price tag on the diamond necklace

Synonyms & Similar Words

• undercover
• covert
• underground
• sneak
• private
• surreptitious
• sneaking
• stealth
• secret
• furtive
• stealthy
• sneaky
• hole-and-corner
• underhanded
• behind-the-scenes
• underhand
• privy
• undisclosed
• backstairs
• hush-hush
• off-the-books
• confidential
• closed-door
• hugger-mugger
• hidden
• off-the-record
• classified
• restricted
• subterranean
• secreted
• concealed
• back-channel
• top secret
• unexposed
• unadvertised

Antonyms & Near Antonyms

• public
• overt
• open
• avowed
• acknowledged
• straightforward
• unclassified
• unrestricted
• obvious
• unconcealed
• evident
• undisguised
• clear
• plain
• manifest
• aboveboard
• patent

Synonym Chooser

How is the word clandestine distinct from other similar adjectives?

Some common synonyms of clandestine are covert, furtive, secret, stealthy, surreptitious, and underhanded. While all these words mean "done without attracting observation," clandestine implies secrecy usually for an evil, illicit, or unauthorized purpose and often emphasizes the fear of being discovered.

a clandestine meeting of conspirators

When is it sensible to use covert instead of clandestine?

The words covert and clandestine can be used in similar contexts, but covert stresses the fact of not being open or declared.

covert intelligence operations

When might furtive be a better fit than clandestine?

While the synonyms furtive and clandestine are close in meaning, furtive implies a sly or cautious stealthiness.

lovers exchanging furtive glances

Where would secret be a reasonable alternative to clandestine?

In some situations, the words secret and clandestine are roughly equivalent. However, secret implies concealment on any grounds for any motive.

met at a secret location

When can stealthy be used instead of clandestine?

Although the words stealthy and clandestine have much in common, stealthy suggests taking pains to avoid being seen or heard especially in some misdoing.

the stealthy step of a burglar

When is surreptitious a more appropriate choice than clandestine?

The meanings of surreptitious and clandestine largely overlap; however, surreptitious applies to action or behavior done secretly often with skillful avoidance of detection and in violation of custom, law, or authority.

the surreptitious stockpiling of weapons

When could underhanded be used to replace clandestine?

While in some cases nearly identical to clandestine, underhanded stresses fraud or deception.

an underhanded trick

Example Sentences

Recent Examples of clandestine

In reality, the clandestine operation meant that, for a portion of time, the President’s real whereabouts were seemingly unknown to—and concealed from—the White House press pool. — Tiago Ventura, Time, 12 Aug. 2026

Mexican authorities have dismantled well over a thousand clandestine drug laboratories, seized enormous quantities of narcotics and fentanyl pills, arrested thousands of cartel operatives, and extradited major criminal figures to the United States. — Chris Shays, Hartford Courant, 7 Aug. 2026

Throughout the previous four years, Russia has, for example, sent drones and clandestine operatives to disrupt European defense production facilities, military bases, and transport infrastructure. — Alexander Gabuev, Foreign Affairs, 31 July 2026

Though the Old Man’s escape from Norway to Mexico had thwarted Moscow’s efforts in late 1936 to extradite him back to the Union of Soviet Socialist Republics (USSR), the GPU’s clandestine operations in Mexico were already underway. — Literary Hub, 28 July 2026

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