'Unable' in the Bible

This dream I, King Nebuchadnezzar, saw; and do you, O Belteshazzar, make clear the sense of it, for all the wise men of my kingdom are unable to make the sense of it clear to me; but you are able, for the spirit of the holy gods is in you.

Then the chief rulers and the captains were looking for some cause for putting Daniel in the wrong in connection with the kingdom, but they were unable to put forward any wrongdoing or error against him; because he was true, and no error or wrong was to be seen in him.

And after he had said these words to me, I kept my face turned to the earth and was unable to say anything.