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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

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

The Central Intelligence Agency in recent months published unusually bold videos in Mandarin openly recruiting Chinese spies from the ranks of the country’s military.

From The Wall Street Journal • Apr. 10, 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

Now she started on state-of-the-art systems for Donovan and his spies.

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