'Sharp' in the Bible

Their arrows are sharp, and every bow is bent: the feet of their horses are like rock, and their wheels are like a rushing storm.

For they are in flight from the sharp sword, and the bent bow, and from the trouble of war.

For the fitches are not crushed with a sharp instrument, and a cart-wheel is not rolled over the cummin; but the grain of the fitches is hammered out with a stick, and of the cummin with a rod.

And he has made my mouth like a sharp sword, in the shade of his hand he has kept me; and he has made me like a polished arrow, keeping me in his secret place;