Mine would have to be The Children of Hurin; anyone agree that it was incredibly dull?
Most difficult to read - to me, anyway - would be Robinson Crusoe, simply because of the insane amounts of semicolons in every mammoth-sized sentence, that once you finish you immediately forget what it was all about.
Most difficult to read - to me, anyway - would be Robinson Crusoe, simply because of the insane amounts of semicolons in every mammoth-sized sentence, that once you finish you immediately forget what it was all about.