1) one who, acting the part of a divinely inspired prophet, utters falsehoods under the name of divine prophecies
2) a false prophet
Part of Speech: noun masculine
Citing in TDNT: 6:781, 952
From G5571 and G4396; a spurious prophet, that is, pretended foreteller or religious impostor: - false prophet.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ψευδοπροφήτης; click on the second column to search for that grammatical form of the root ψευδοπροφήτης; click on the third column to search for that word and grammatical form; click on the total to search for the root ψευδοπροφήτης.