A person who has an excessive enthusiasm or desire for something:
The definition of a lunatic is a person who is either actually crazy or who is acting crazy and wild in his behavior.
A person, esp. a man, who is demented or insane; lunatic; maniac
Find another word for psychopaths. In this page you can discover 4 synonyms, antonyms, idiomatic expressions, and related words for psychopaths, like: maniacs, lunatics, madmen and fools.