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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.

The American spies didn’t do it for money, which Cuba had little of, but because they were sympathetic to the revolution.

From The Wall Street Journal • May 25, 2026

He also served in al-Majd, the internal security force that rooted out collaborators and spies.

From The Wall Street Journal • May 16, 2026

Last year, the government faced a row after proposing amendments that would see spies brought within the scope of the law, but only with the approval of the head of their services.

From BBC • Apr. 15, 2026

A member of the public was killed after handling the delivery device, a discarded perfume bottle, triggering the largest Western expulsion in decades of Russian diplomats alleged to be spies.

From Barron's • Mar. 30, 2026

“Contrary to what you’ve seen at the cinema, spies have practical cars that don’t attract attention,” he said.

From "City Spies" by James Ponti