A couple days ago I finally got being a good startup founder down to two words: relentlessly resourceful.
Till then the best I'd managed was to get the opposite quality down to one: hapless. Most dictionaries say hapless means unlucky. But the dictionaries are not doing a very good job. A team that outplays its opponents but loses because of a bad decision by the referee could be called unlucky, but not hapless. Hapless implies passivity. To be hapless is to be battered by circumstances—to let the world have its way with you, instead of having your way with the world. 
Read the rest of Paul Graham here.