GOD'S WORD® Translation
If an ax is blunt and the edge isn't sharpened, then one has to use more strength. But wisdom prepares the way for success.

American Standard Version
If the iron be blunt, and one do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.

Berean Study Bible
If the axe is dull and the blade unsharpened, more strength must be exerted, but skill produces success.

Douay-Rheims Bible
If the iron be blunt, and be not as before, but be made blunt, with much labour it shall be sharpened: and after industry shall follow wisdom.

English Revised Version
If the iron be blunt, and one do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.

King James Bible
If the iron be blunt, and he do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.

World English Bible
If the axe is blunt, and one doesn't sharpen the edge, then he must use more strength; but skill brings success.

Young's Literal Translation
If the iron hath been blunt, And he the face hath not sharpened, Then doth he increase strength, And wisdom is advantageous to make right.

Ecclesiastes 10:10 Additional Translations ...