I like resolve as a noun. The Merriam-Webster Dictionary defines the noun resolve as "a firm or unwavering adherence to one's purpose." Attributes like this make me think of characters.
Resolve is really a great attribute to have. When you think about it, resolve is almost always an attribute a successful main character has. As writers we usually give our main character a problem right out of the gate and then throw obstacles at them all throughout the story which they have to overcome if they want to reach the goal or solve the problem. If they don't have resolve, they aren't going to make it.
With a lot of characters, or real people for that matter, resolve can't happen until one discovers one's purpose and that is sometimes the hardest part. Once one's purpose is really known and understood, resolve often becomes a much easier enterprise and then so does the overcoming of obstacles and the solving of problems.