This describes a person that works hard at what they are doing regardless of the effort. A quitter typically is just plain lazy and gives up for lack of effort and therefore never finishes or achieves their goal(win). I read some interesting blogs on this and one in particular reminds us that effort alone is not enough to be a winner. You must apply intelligence and sometimes adjust your goals based on sound logic. It's not quitting, it's adjusting. Just don't use it as an excuse!