Pronunciation: /ɪmˈpɑːstər/
noun A person who deceives others by pretending to be someone else
A1 The impostor pretended to be someone they were not.
A2 The impostor was caught trying to enter the building with a fake ID.
B1 The impostor's true identity was revealed when their fingerprints were matched.
B2 The impostor had successfully infiltrated the organization for months before being discovered.
C1 The impostor had meticulously planned their deception, fooling even the most experienced investigators.
C2 The impostor's elaborate scheme unraveled when their alibi was proven to be false.
formal The company hired a private investigator to uncover the impostor among the employees.
informal I think John might be an impostor because his story keeps changing.
slang I can't believe she was pretending to be a doctor, what an impostor!
figurative His charming facade was just a mask for the impostor within.
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