'Sharp' in the Bible

whose arrows are sharp, and all their bows bent; their horses hoofs shall be accounted as flint, and their wheels as a whirlwind:

For the fitches are not threshed with a sharp threshing instrument, neither is a cart wheel turned about upon the cummin; but the fitches are beaten out with a staff, and the cummin with a rod.

Behold, I have made thee to be a new sharp threshing instrument having teeth; thou shalt thresh the mountains, and beat them small, and shalt make the hills as chaff.

and he hath made my mouth like a sharp sword; in the shadow of his hand hath he hid me: and he hath made me a polished shaft; in his quiver hath he kept me close: