Verses with the word weak in the Old Testament (16 verses):

Numbers 13:18
And see the land, what it is, and the people that dwelleth therein, whether they be strong or weak, few or many;

Judges 16:7
And Samson said unto her, If they bind me with seven green withs that were never dried, then shall I be weak, and be as another man.

Judges 16:11
And he said unto her, If they bind me fast with new ropes that never were occupied, then shall I be weak, and be as another man.

Judges 16:17
That he told her all his heart, and said unto her, There hath not come a razor upon mine head; for I have been a Nazarite unto God from my mother's womb: if I be shaven, then my strength will go from me, and I shall become weak, and be like any other man.

2 Samuel 3:39
And I am this day weak, though anointed king; and these men the sons of Zeruiah be too hard for me: the LORD shall reward the doer of evil according to his wickedness.

2 Samuel 17:2
And I will come upon him while he is weary and weak handed, and will make him afraid: and all the people that are with him shall flee; and I will smite the king only:

2 Chronicles 15:7
Be ye strong therefore, and let not your hands be weak: for your work shall be rewarded.

Job 4:3
Behold, thou hast instructed many, and thou hast strengthened the weak hands.

Psalms 6:2
Have mercy upon me, O LORD; for I am weak: O LORD, heal me; for my bones are vexed.

Psalms 109:24
My knees are weak through fasting; and my flesh faileth of fatness.

Isaiah 14:10
All they shall speak and say unto thee, Art thou also become weak as we? art thou become like unto us?

Isaiah 35:3
Strengthen ye the weak hands, and confirm the feeble knees.

Ezekiel 7:17
All hands shall be feeble, and all knees shall be weak as water.

Ezekiel 16:30
How weak is thine heart, saith the LORD GOD, seeing thou doest all these things, the work of an imperious whorish woman;

Ezekiel 21:7
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.

Joel 3:10
Beat your plowshares into swords and your pruninghooks into spears: let the weak say, I am strong.