Ne'er do well is a person or thing that is no good, that is not capable or not willing to do what is expected or proper.
An example of a ne'er do well is a guy who just won't get a job or do anything productive with his life.
a person who never does anything worthwhile; one who cannot make a living, get things done, etc.
lazy, inadequate, etc.
An idle, irresponsible person.
- A person without a means of support; an idle, worthless person; a loafer; a person who is ineffectual, unsuccessful, or completely lacking in merit; a good-for-nothing.
- A person who is up to no good; a rogue.