Is there a word to describe someone who keeps trying to do something but always fails?

Do you continue to challenge but are there words that explain those who fail? This is not explained in a positive sense like a person who never gives up, but it is details about the downside of always failing.

For example, people who create lots of failed business, people who never eat with meals, or people who can not be loyal to partners.

More background will help narrow down the possible words that might fit this person. Why did they fail? Are their goals too high to get the skills they need to succeed? Are they lazy? Do they lack patience to stick to their goals? All of these scenarios use different words to explain this failure. - Christina Lopez

I am going to give you a decisive example for narrowing the scope: people try to eat and exercise, but even if it is not good for them, they always collapse and eat unhealthy things , And / or skip movement. Those who are able to do this perfectly have sufficient mind and knowledge about their reasons and methods, but in any case, they will fail each time they start after a while. I am not talking about unhappy people and stupid innocents.

However, I do not want to limit this term to a diet (like "fat": P), but I would like to use words that can be used for other (similar) backgrounds. I think I can understand it

If you mistake or fail, this secret should motivate you to keep working hard. Every really successful story begins with people who fail many times before they succeed. If you think that something is too rewarding for you, you know that you will suck it - but that is okay. You will get better. Let's play for devil supporters for yourself - try to find the point of failure of your business idea everyday. In other words, when you wake up every day you will think that what you ignore will destroy your company. Do not confuse this with confidence induction. Training yourself in this way will make it possible for you to decisively modify and tweak your innovation. If you accept the challenge before you try, you will gain confidence

There is no failure. If you tried to do something but failed you will not fail at any time. You learned that it will not work. Always ask, "What can we learn from things that did not work?", "Can you explain something you did not explain?", "What you discovered, did not start discovering". When you do not make a mistake, you will talk to someone who has never tried anything new. Learn to think unconventionally. Creative genius does not think about analysis or logic. Traditional, logical, analytic thinkers are exclusive thinkers and eliminate all information unrelated to the problem. They look for ways to eliminate that possibility. Creative genius is a comprehensive thinker, which means that they are looking for ways to include everything, including different and totally unrelated ones.

Writing and creative life: "12 things about creative thinking in school"