noun: someone who cheats people by claiming to have special knowledge or abilities
noun: a flamboyant deceiver; one who attracts customers with tricks or jokes
"In such fields of research, Mr. Keely finds little leisure. Those who accuse him of "dilly-dallying," of idleness, of "always going to do and never doing," of "visionary plans," etc., etc., know nothing of the infinite patience, the persistent energy which for a quarter of a century has upheld him in his struggle to attain this end. Still less, if possible, is he understood by those who think he is seeking self-aggrandizement, fame, fortune, or glory.
The time is approaching when all who have sought to defame this discoverer and inventor, all who have stabbed him with unmerited accusations, all who have denounced him as "a bogus inventor," "a fraud," "an impostor," "a charlatan," "a modern Cagliostro," will be forced to acknowledge that he has done a giant's work for true science, even though he should not live to attain commercial success. But history will not forget that, in the nineteenth century, the story of Prometheus has been repeated, and that the greatest mind of the age, seeking to scale the heavens to bring down the light of truth for mankind, met with Prometheus's reward." [Keely - Cure of Disease]