'Unable' in the Bible

The scouts left for the hill country and remained there for three days until the search party returned. The search party searched the entire road, but was unable to find them.

The Israelis have been unable to stand before their enemies. They're turning their backs and running from their enemies because they themselves have been turned over to destruction. I will not be with you anymore unless you destroy these things that have been turned over to destruction.

Then the men of Ai looked back behind them and all of a sudden! smoke from the city was rising into the sky. They were unable to run in any direction, because the Israelis who had fled toward the wilderness had turned around to attack their pursuers.