What is the root or base word of intractable?

The root word of "intractable" is tract, which means "to draw, pull, or drag".

Here's how it breaks down:

* in-: A prefix meaning "not" or "opposite of"

* tract: The root word, meaning "to draw, pull, or drag"

* -able: A suffix meaning "capable of being"

So, "intractable" literally means "not capable of being drawn or pulled" or "not capable of being managed or controlled".