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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.

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

From The Wall Street Journal • May 16, 2026

However, the bill's progress through Parliament stalled earlier this year over disagreements between the government and campaigners about how the new legal duty of candour should apply to spies.

From BBC • Apr. 13, 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

But this is, after all, television, and “CIA” knows what some of us want, or will settle for, from our spies.

From Los Angeles Times • Feb. 23, 2026

“You know, before I found out about teenage spies and castles with hidden rooms.”

From "City Spies" by James Ponti