Of the words I have a visceral understanding, insatiable is one.
I can't tell you how many times in the past my wife asked "isn't that enough?" or "why do you need more?". I didn't understand the questions, the drunker I got the more I wanted. It's definitely a progression drinking with the cravings(keeping up to or trying to out run the 'itch') to developing a dependence and then to addiction. But it need not be inevitable.