0 a person who pretends to be someone else in order to deceive others:
He felt like an impostor among all those intelligent people, as if he had no right to be there.
1 a person who pretends to be someone else in order to deceive others
This disorder is defined as a delusion that a close relative or friend has been replaced by an impostor.
In the beginning of this poem the fox is anything but a successful impostor, being generally outwitted by far weaker animals.
She then handed over the money to an accomplice of the impostor.
The celebrity panelists question the three contestants; the impostors are allowed to lie but the central character is sworn to tell the truth.
It would have been said, in varying tones of indignation, that he was little better than a hollow impostor and meant to go no further.
Would he be sufficiently protected if the vendor or the purporting vendor were in fact an impostor?
If so, then we are nothing but a bunch of impostors, applying different standards to different countries.
The important thing is that individual touch should be kept with the men, so that they should not help men who are impostors.
