'Able' in the Bible

And the king of Moab seeth that the battle has been too strong for him, and he taketh with him seven hundred men, drawing sword, to cleave through unto the king of Edom, and they have not been able,

and they pour out for the men to eat, and it cometh to pass at their eating of the pottage, that they have cried out, and say, 'Death is in the pot, O man of God!' and they have not been able to eat.

Then doth Rezin king of Aram go up, and Pekah son of Remaliah king of Israel, to Jerusalem, to battle, and they lay siege to Ahaz, and they have not been able to fight.

'And, now, give a pledge for thee, I pray thee, to my lord the king of Asshur, and I give to thee two thousand horses, if thou art able to give for thee riders on them.

thus said the king, Let not Hezekiah lift you up, for he is not able to deliver you out of his hand;