GOD'S WORD® Translation
He gives strength to those who grow tired and increases the strength of those who are weak.

American Standard Version
He giveth power to the faint; and to him that hath no might he increaseth strength.

Berean Study Bible
He gives power to the faint and increases the strength of the weak.

Douay-Rheims Bible
It is he that giveth strength to the weary, and increaseth force and might to them that are not.

English Revised Version
He giveth power to the faint; and to him that hath no might he increaseth strength.

King James Bible
He giveth power to the faint; and to them that have no might he increaseth strength.

World English Bible
He gives power to the weak. He increases the strength of him who has no might.

Young's Literal Translation
He is giving power to the weary, And to those not strong He increaseth might.

Isaiah 40:29 Additional Translations ...