Why is unenthralling not a real word?

Well I was thinking today (I know, when am I not thinking?)...about thinking. Because of a thought provoking discussion on the idea of "unnecessarily thinking," or as I tried to correct myself and say "unnecessarily doubting." Is there such a thing?

The argument was posed to me that "doubting makes you wonder, makes you question, makes you think...and that is never unnecessary." I started to ask, what about when someone makes you doubt something you were previously sure of, but then I sort of dropped the conversation. Because I had brought up a good point to myself.

Today I changed the word "doubt" to "second-guessing," because I feel that it has less of a negative connotation and I wanted to look at this as unbiasedly as possible. So, is it unnecessary to second-guess something I thought I was sure of? Maybe not. Maybe I spoke too carelessly, used the word unnecessary too freely. Unnecessary means something is not needed, but truthfully, shouldn't a degree of second-guessing always be needed? If everyone just accepted everything they were told, the world would be a very unenthralling place to live and there would be a complete absence of free thought - something I feel very strongly about.

So in the grand scheme of things, I would have to disagree with my original statement and agree with the opposing statement...thinking is not unnecessary. You win this time, punk. :) But in the smaller context I used it in, I still think I'm right, so there. :P