Okay, maybe "teensiest" is the wrong modifier. Fact is, when I dig in my heels, I can give a mule a run for its money.
Now, stubborn can be good or stupid, depending.
Good stubborn: "I don't care how much you beg me, you are not staying out past curfew on a school night." (Granted, this is from a parental point of view. Stubbornness is an essential attribute in a parent.)
Stupid stubborn: "Sure, I might have the flu, but no way am I going to bed, because the world will fall apart without me." (Trust me, you will fall apart long before the world does.)
There is, of course, a writing tie-in. (What? Like you're surprised.)
Good writing stubborn: I will keep working on this darn book until I get it right. I will keep querying until I find the right agent for me. (I can testify that this pays off.) I will take criticism without throwing a tantrum (publicly), and apply what I learn to my manuscript until I make it the best it can be. And if this book doesn't work, I will apply everything I've learned to the next book. And the one after that.
Stupid writing stubborn: This is how I wrote it, dammit, and this is exactly how it's going to stay, no matter what. These are words my muse fed me, and if people don't "get" it, that's their problem.
See the difference? I mean, there's persevering, and then there's banging your head against a brick wall, thinking eventually you'll bring the wall down. Something's gotta give. Clue: it isn't going to be the wall.
Oh, and there's one more category: Silly Stubborn. If you, say, refuse to see Titanic simply because so many people told you that you just had to see it, and then it becomes kind of a thing not to see it...well, that might be a little silly. (Guilty.)
So, any other mules out there? What kind of stubborn are you? Examples if you have 'em, please. :)