GOD'S WORD® Translation
Don't curse the king even in your thoughts, and don't curse rich people even in your bedroom. A bird may carry your words, or some winged creature may repeat what you say.

American Standard Version
Revile not the king, no, not in thy thought; and revile not the rich in thy bedchamber: for a bird of the heavens shall carry the voice, and that which hath wings shall tell the matter.

Berean Study Bible
Do not curse the king even in your thoughts, or curse the rich even in your bedroom, for a bird of the air may carry your words, and a winged creature may report your speech.

Douay-Rheims Bible
Detract not the king, no not in thy thought; and speak not evil of the rich man in thy private chamber: because even the birds of the air will carry thy voice, and he that hath wings will tell what thou hast said.

English Revised Version
Curse not the king, no, not in thy thought; and curse not the rich in thy bedchamber: for a bird of the air shall carry the voice, and that which hath wings shall tell the matter.

King James Bible
Curse not the king, no not in thy thought; and curse not the rich in thy bedchamber: for a bird of the air shall carry the voice, and that which hath wings shall tell the matter.

World English Bible
Don't curse the king, no, not in your thoughts; and don't curse the rich in your bedroom: for a bird of the sky may carry your voice, and that which has wings may tell the matter.

Young's Literal Translation
Even in thy mind a king revile not, And in the inner parts of thy bed-chamber Revile not the rich: For a fowl of the heavens causeth the voice to go, And a possessor of wings declareth the word.

Ecclesiastes 10:20 Additional Translations ...