What is the one word substitution for "one who thinks that he is doing something great but in reality there is no progress in his life"..?
having false or unrealistic beliefs or opinions
Senators who think they will get agreement on a comprehensive tax bill are delusional.
(Psychiatry) maintaining fixed false beliefs even when confronted with facts, usually as a result of mental illness
He was so delusional and paranoid that he thought everybody was conspiring against him.
Ouch, bit of a harsh definition. Perhaps:
Idler: A person who passes time without being engaged in purposeful activity
Laggard: A person who makes slow progress and falls behind others.
Or because it's fun to say, a:
Ne'er-do-well: A person who is ineffectual, idle, unsuccessful, or completely lacking in merit.
I'd also probably put "delusional" infront of these as delusion by itself doesn't mean the person is going no-where. I mean, Donald Trump is fairly delusional and he's a billionaire running for the U.S. presidency. ;)
In 2011, David Dunning wrote about his observations that people with substantial, measurable deficits in their knowledge or expertise lack the ability to recognize those deficits and, therefore, despite potentially making error after error, tend to think they are performing competently when they are not: "In short, those who are incompetent, for lack of a better term, should have little insight into their incompetence—an assertion that has come to be known as the Dunning–Kruger effect". In 2014, Dunning and Helzer described how the Dunning–Kruger effect "suggests that poor performers are not in a position to recognize the shortcomings in their performance".