New International Version
Folly brings joy to one who has no sense, but whoever has understanding keeps a straight course.

American Standard Version
Folly is joy to him that is void of wisdom; But a man of understanding maketh straight his going.

Berean Study Bible
Folly is joy to one who lacks judgment, but a man of understanding walks a straight path.

Douay-Rheims Bible
Folly is joy to the fool: and the wise man maketh straight his steps.

English Revised Version
Folly is joy to him that is void of wisdom: but a man of understanding maketh straight his going.

King James Bible
Folly is joy to him that is destitute of wisdom: but a man of understanding walketh uprightly.

World English Bible
Folly is joy to one who is void of wisdom, but a man of understanding keeps his way straight.

Young's Literal Translation
Folly is joy to one lacking heart, And a man of intelligence directeth his going.

Proverbs 15:21 Additional Translations ...