'Weak' in the Bible

All hands shall be feeble, and all knees shall be weak as water.

How weak is thine heart, saith the Lord GOD, seeing thou doest all these things, the work of an imperious whorish woman;

And it shall be, when they say unto thee, Wherefore sighest thou? that thou shalt answer, For the tidings; because it cometh: and every heart shall melt, and all hands shall be feeble, and every spirit shall faint, and all knees shall be weak as water: behold, it cometh, and shall be brought to pass, saith the Lord GOD.