'Unable' in the Bible

All things are wearisome;man is unable to speak.The eye is not satisfied by seeingor the ear filled with hearing.

He has made everything right in its time; but he has made their hearts without knowledge, so that man is unable to see the works of God, from the first to the last.

I observed all the work of God and concluded that man is unable to discover the work that is done under the sun. Even though a man labors hard to explore it, he cannot find it; even if the wise man claims to know it, he is unable to discover it.

In the day when the keepers of the house are shaking for fear, and the strong men are bent down, and the women who were crushing the grain are at rest because their number is small, and those looking out of the windows are unable to see;