New King James Version
Whoever curses his father or his mother, His lamp will be put out in deep darkness.

King James Bible
Whoso curseth his father or his mother, his lamp shall be put out in obscure darkness.

American Standard Version
Whoso curseth his father or his mother, His lamp shall be put out in blackness of darkness.

Berean Study Bible
Whoever curses his father or mother, his lamp will be extinguished in deepest darkness.

Douay-Rheims Bible
He that curseth his father, and mother, his lamp shall be put out in the midst of darkness.

English Revised Version
Whoso curseth his father or his mother, his lamp shall be put out in the blackest darkness.

World English Bible
Whoever curses his father or his mother, his lamp shall be put out in blackness of darkness.

Young's Literal Translation
Whoso is vilifying his father and his mother, Extinguished is his lamp in blackness of darkness.

Proverbs 20:20 Additional Translations ...