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

Adult Swim viewers became part of a late-night collective bearing witness to clandestine artifacts anyone who went to bed at a reasonable hour would only hear about from their bleary-eyed friends. —Eric Vilas-Boas, Vulture, 18 Mar. 2026

The documentary is built around the investigative work of journalists Katya Hakim and Denis Korotkov who picked up the mantle from three colleagues who were brutally slain while looking into Wagner’s clandestine activities in Africa. —Matthew Carey, Deadline, 10 Mar. 2026

On this occasion in 2018, Rodriguez and others in the group had received an anonymous tip of a possible clandestine cemetery on the outskirts of Cordoba. —Kamala Thiagarajan, NPR, 8 Mar. 2026

This British series sees big-city businessman Gavin Shipman (Mathew Horne) fall in love with small-town Welsh woman Nessa Jenkins (Ruth Jones) through clandestine late-night phone calls. —Declan Gallagher, Entertainment Weekly, 7 Mar. 2026

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