It is curious enough that this sentence of the Bishop is, itself, ungrammatical!
His dress was very plain and poor, his manner was uncultured, his language was ungrammatical.
If I were asked an opinion I would call this an ungrammatical nation.
She knew that he was ungrammatical, but she denied that he was uncouth.
Which was ungrammatical, I admit, but the best I could do ...