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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.

As the war progressed, the Greek Desk became adept, if not war-altering, spies.

From The Wall Street Journal • May 31, 2026

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

Many countries have up to two diplomatic missions to these international organisations, as well as an embassy - providing both diplomatic immunity and cover for spies.

From BBC • May 4, 2026

In November, Britain's domestic intelligence agency MI5 warned that China was using spies disguised as head-hunters to recruit parliamentarians, through LinkedIn among others.

From Barron's • Mar. 27, 2026

Although her main job involved tracking spies and ships for the Treasury Department and the Coast Guard, others in Washington sought her help, too.

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