You are asking about a rare use of "enough", a negative sense. Normally, enough is a good thing. A meal that is poor enough is not quite pure garbage, but it will not make you happy, either.
You found it in Dickens, in a story written in 1843 in England. I would say that this use of "enough" would be unusual in the US today. Your example---old enough to drive---is not the same. For one thing, the negative "enough" doesn't take modifiers.
His blind date turned out to be homely enough (negative sense), but they wound up getting married, and their kids were ugly enough to make a freight train take a dirt road (positive sense).
Student or Learner