'Dark' in the Bible

because an excellent spirit, and knowledge, and understanding, interpreting of dreams, and showing of dark sentences, and dissolving of doubts, were found in the same Daniel, whom the king named Belteshazzar. Now let Daniel be called, and he will show the interpretation.

In the latter time of their kingdom, when the transgressors are come to the full, a king of fierce face, and understanding dark sentences, shall stand up.