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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.

Cuban spies have been adept at recruiting American officials, turning some into moles who handed over secrets for decades.

From The Wall Street Journal • May 25, 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

Iran's Revolutionary Guards said their forces had arrested 10 "foreign spies" in the northeastern Razavi Khorasan province but did not give their nationalities.

From Barron's • Mar. 17, 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

Jones wanted the unit to focus closely on South American spies.

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