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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

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

Posing as recruiters on the online professional networking platform, Chinese spies would initially request paid reports before later soliciting non-public or even classified information.

From Barron's • Mar. 27, 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

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

From "City Spies" by James Ponti