'Unable' in the Bible

And when they were unable to get near him because of all the people, they got the roof uncovered where he was: and when it was broken up, they let down the bed on which the man was.

And he was unable to do any work of power there, but only to put his hands on one or two persons who were ill, and make them well.

And when he had gone into the house, his disciples said to him privately, Why were we unable to send it out?

Now the chief priests and all the Sanhedrin were looking for witness against Jesus so that they might put him to death; and they were unable to get any.