'Weak' in the Bible

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

How weak is thy heart, saith the Lord Jehovah, seeing thou doest all these things, the work of an impudent harlot;

And it shall be, when they say unto thee, Wherefore sighest thou? that thou shalt say, Because of the tidings, for 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 it shall be done, saith the Lord Jehovah.