New Living Translation
Fill in the valleys, and level the mountains and hills. Straighten the curves, and smooth out the rough places.

American Standard Version
Every valley shall be exalted, and every mountain and hill shall be made low; and the uneven shall be made level, and the rough places a plain:

Berean Study Bible
Every valley shall be lifted up, and every mountain and hill made low; the uneven ground will become smooth, and the rugged land a plain.

Douay-Rheims Bible
Every valley shall be exalted, and every mountain and hill shall be made low, and the crooked shall become straight, and the rough ways plain.

English Revised Version
Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain:

King James Bible
Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain:

World English Bible
Every valley shall be exalted, and every mountain and hill shall be made low. The uneven shall be made level, and the rough places a plain.

Young's Literal Translation
Every valley is raised up, And every mountain and hill become low, And the crooked place hath become a plain, And the entangled places a valley.

Isaiah 40:4 Additional Translations ...