Idiot

As you may have gathered, I have a fondness for the word 'idiot'. I like the connotations derived from its etymology. According to Wikipedia, 'Idiot is a word derived from the Greek ἰδιώτης, idiōtēs ("person lacking professional skill," "a private citizen," "individual"), from ἴδιος, idios ("private," "one's own").'

In the same vein, Philip K Dick wrote some interesting things about the idiocosmos, a private world, something that features in many of his books.