Next day his luggage arrived through the slush—and very remarkable luggage it was. There were a couple of trunks indeed, such as a rational man might need, but in addition there were a box of books—big, fat books, of which some were just in an incomprehensible handwriting—and a dozen or more crates, boxes, and cases, containing objects packed in straw, as it seemed to Hall, tugging with a casual curiosity at the straw—glass bottles.
Which is the best meaning for incomprehensible as it is used in the selected sentence?
