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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 name, first used by a band of World War I-era Jewish spies, signified that no one identified in the attack would be forgotten.

From The Wall Street Journal • May 21, 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

Speaking from the Evin jail in Tehran, Craig Foreman appealed to the government to state publicly that they are not spies.

From BBC • Mar. 23, 2026

The monotone transmission recalled the manner in which deep-cover Cold War spies for the KGB and CIA once received orders.

From Los Angeles Times • Mar. 10, 2026

Six months later, when the Long Island station was finally shut down, Elizebeth learned that the FBI had actually been running it as part of a sting operation to catch Nazi spies.

From "The Woman All Spies Fear" by Amy Butler Greenfield