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spies

NOUN

person who secretly finds out about another's business

Synonyms

STRONGEST

agent detective informer investigator mole operative secret agent secret service undercover agent

STRONG

emissary lookout observer patrol picket plant scout sleeper sleuth snoop spook spotter watcher

WEAK

double agent espionage agent foreign agent inside agent intelligencer

VERB

secretly follow, watch another's actions

Synonyms

STRONGEST

discover examine scrutinize snoop

STRONG

case eyeball glimpse meddle notice observe peep pry reconnoiter scout search shadow sleuth spot stag tail trail view watch

WEAK

catch sight of fish out get a load of keep under surveillance look for recon set eyes on stake out take in take note

Antonyms

STRONG

ignore miss neglect overlook

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

However, the bill's progress through Parliament stalled earlier this year over disagreements between the government and campaigners about how the new legal duty of candour should apply to spies.

From BBC • Apr. 13, 2026

Posing as recruiters on the online professional networking platform, Chinese spies would initially request paid reports before later soliciting non-public or even classified information.

From Barron's • Mar. 27, 2026

"We don't have spies in the training centre to deliver the info to our media," said Guardiola.

From BBC • Feb. 28, 2026

But this is, after all, television, and “CIA” knows what some of us want, or will settle for, from our spies.

From Los Angeles Times • Feb. 23, 2026

In 1949 the Soviets tested their first atomic bomb, using plans stolen by spies from American labs.

From "Most Dangerous: Daniel Ellsberg and the Secret History of the Vietnam War" by Steve Sheinkin