You searched for: “maniac
maniac (s) (noun), maniacs (pl)
1. Considered an “obsolete” term for a mentally ill or disturbed person: A maniac can also be described as a lunatic, a deranged person, a psychopath, a madman, or a madwoman.
2. Someone who suffers from, or who has, a mental derangement: A maniac is characterized by great excitement, delusions and hallucinations and, in extreme stages, by great violence.
(Greek: a specific mental disorder or obsessive preoccupation with something; madness, frenzy; obsession, or abnormal desire for or with something or someone; also, an excessive enthusiasm or fondness for something that is not safe or advantageous)