n. Someone who attempts to deceive by using an assumed name or identity or other devious disguise.
The Century Dictionary and Cyclopedia
n. See impostor.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who makes deceitful pretenses
Word Usage
"Atlanta psychologist Pauline Clance, along with colleague Suzanne Imes, coined the term "imposter syndrome" in 1978, after an interviewee in their research study said she "felt like an imposter, here with all these really bright people.""