If there is one word that best describes what it takes to be a successful entrepreneur, it is tenacity. Synonyms include determination; perseverance; doggedness; strength of purpose; tirelessness; indefatigability; resolution; resoluteness; resolve; firmness; steadfastness; staying power; endurance; stamina; stubbornness; obstinacy; and pertinacity. Things will go wrong in your business, sometimes daily. Develop your tenacity. It will serve you well.