'Unable' in the Bible

Then God asked him, "Who gives a person a mouth? Who makes him unable to speak, or deaf, or able to see, or blind, or lame? Is it not I, the LORD?

The fish in the Nile River will die and the river will stink. The Egyptians will be unable to drink water from the Nile River."'"

The magicians tried to do the same thing with their secret arts, but they were unable to bring out the gnats. The gnats were on the people and the animals.