noun
a person who secretly listens to the private conversations of others
adjective
eavesdropping (related to the act of secretly listening to conversations)
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The eavesdropper was caught listening in on the private conversation.
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I saw the eavesdropper trying to sneak a listen to our chat.
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That eavesdropper is always trying to be nosy.
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The walls have ears, so be careful of any potential eavesdropper.