| observing | | |
| adj. | 1. observant, observing | quick to notice; showing quick and keen perception. |
| ~ perceptive | having the ability to perceive or understand; keen in discernment.; "a perceptive eye"; "a perceptive observation" |
| spy | | |
| n. (person) | 1. spy, undercover agent | (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors. |
| ~ armed forces, armed services, military, military machine, war machine | the military forces of a nation.; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker" |
| ~ counterspy, mole | a spy who works against enemy espionage. |
| ~ double agent | a spy who works for two mutually antagonistic countries. |
| ~ espionage agent | someone employed to spy on another country or business competitor. |
| ~ foreign agent | a spy for a foreign country. |
| ~ infiltrator | someone who takes up a position surreptitiously for the purpose of espionage. |
| ~ intelligence agent, intelligence officer, operative, secret agent | a person secretly employed in espionage for a government. |
| ~ sleeper | a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal. |
| ~ margarete gertrud zelle, mata hari | Dutch dancer who was executed by the French as a German spy in World War I (1876-1917). |
| n. (person) | 2. spy | a secret watcher; someone who secretly watches other people.; "my spies tell me that you had a good time last night" |
| ~ snoop, snooper | a spy who makes uninvited inquiries into the private affairs of others. |
| ~ looker, spectator, viewer, watcher, witness | a close observer; someone who looks at something (such as an exhibition of some kind).; "the spectators applauded the performance"; "television viewers"; "sky watchers discovered a new star" |
| ~ shadower, tail, shadow | a spy employed to follow someone and report their movements. |
| v. (perception) | 3. descry, espy, spot, spy | catch sight of. |
| ~ sight, spy | catch sight of; to perceive with the eyes.; "he caught sight of the king's men coming over the ridge" |
| v. (communication) | 4. sleuth, snoop, spy, stag | watch, observe, or inquire secretly. |
| ~ enquire, investigate, inquire | conduct an inquiry or investigation of.; "The district attorney's office investigated reports of possible irregularities"; "inquire into the disappearance of the rich old lady" |
| ~ monitor, supervise | keep tabs on; keep an eye on; keep under surveillance.; "we are monitoring the air quality"; "the police monitor the suspect's moves" |
| v. (perception) | 5. sight, spy | catch sight of; to perceive with the eyes.; "he caught sight of the king's men coming over the ridge" |
| ~ perceive, comprehend | to become aware of through the senses.; "I could perceive the ship coming over the horizon" |
| ~ descry, espy, spot, spy | catch sight of. |
| ~ detect, discover, notice, observe, find | discover or determine the existence, presence, or fact of.; "She detected high levels of lead in her drinking water"; "We found traces of lead in the paint" |
| v. (communication) | 6. spy | secretly collect sensitive or classified information; engage in espionage.; "spy for the Russians" |
| ~ enquire, investigate, inquire | conduct an inquiry or investigation of.; "The district attorney's office investigated reports of possible irregularities"; "inquire into the disappearance of the rich old lady" |
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