spied

Noticed from afar

Spied is the past tense of spy.

To spy is to watch secretly, often for intelligence purposes: She spied on the neighbors through the blinds.

To spy something is to catch sight of it: He spied a familiar face in the crowd.

The word carries connotations of stealth and discovery.

observed

noticed

Became aware of

detected · perceived · discerned · witnessed · beheld · eyed · viewed · caught sight of · made out · descried

surveillance

watched

Saw with attention

shadowed · followed · staked out · bugged · wiretapped · recorded · surveilled · snooped · eavesdropped · scrutinized

secretive

furtive

Secretive and sly

clandestine · sneaky · undetected · unseen · incognito · undercover · discreet · sub rosa · on the sly · peeked

espionage

agent

One who acts independently

informant · mole · handler · asset · covert · reconnaissance · counterintelligence · mission · debrief · infiltrate

Opposites
secrecy of observation

spiedstared

Looked long and hard

gazed · viewed · witnessed

direction of information flow

spieddisclosed

Made previously hidden known

revealed · exposed · divulged · broadcast · announced

awareness/detection

spiedmissed

Failed to reach

overlooked · ignored · disregarded · passed over · neglected

Phrases
Family

spies, espionage, espied

Familiarity
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Known to kids · Used worldwide · Timeless · Everyday, not technical · Rated G