This is what Merriam Webster has to say about it.
Meticulous: Marked by extreme or excessive care in the consideration or treatment of details
Underthought: The word you've entered isn't in the dictionary.
Suggestions for Underthought:
Since it does not mean any of the above ten, what does it mean?
What it is meant to mean is, something like undercooked. In short, put together it is like whatever you see here has gone through the careful consideration that it must not have any structured/branded thoughts backing it. It is just a bunch of wild thoughts, simple :)
Now, if you want to bestow me with some level of intelligence [totally uncalled for and also a dangerous precedent :p], you can say it means something like being under the process of thought. But that angle is really unintentional and I would not back it up.
Yes Anita, there is no such word. But this is reason good enough for me to stick to it. Now, I find another explanation for the word, something like an underlying thought. Methinks I should stop when I can, this can go on and on. :D