Do-little

Great talkers are commonly do-littles.

Source: wiktionary

"Is that all I am good for now? I was good for mair than that in the great fight between our folk and Patrico Salmon's; if I had not helped you with these very fambles, (holding up her hands) Jean Baillie would have frummagem'd you, ye feckless do-little."

Source: wiktionary

I know an instance of a woman, who by labor and economy had scraped together a little maintenance for herself and a do-little husband, who was left, at his death, by virtue of his last will and testament, to be supported by charity.

Source: wiktionary

Joe Ed was a stocky blond boy who could play a guitar and shoot the eye out of a possum at fifty yards—but not much else. What astonished everyone was Florella’s regard for such a do-little, since she was halfway promised to a boy from Owl’s Hollow.

Source: wiktionary