1. a person who pretends to be someone else in order to deceive others

Examples

• The impostor claimed to be a famous doctor but had no medical training.
• Security cameras helped identify the impostor who was using stolen credit cards.
• She felt like an impostor at the fancy dinner party.
• The impostor fooled everyone with his fake accent and forged documents.
• Police arrested the impostor who had been posing as a police officer.
• Many successful people suffer from impostor syndrome, feeling unworthy of their achievements.