What is a drunkard?

beer An attempt to explain the meaning of this mysterious word (that is, drunkard) has been done by two famous philosophers of our past.
 
Here follows the English translation of this terrific essay (pamphlet? dissertation?) by Stefano Benni, one of the funniest Italian writers of the last decades. An attempt to explain the meaning of this mysterious word.

So, what is a drunkard?