The heaven
shamayim  (shaw-mah'-yim)
air, astrologer, heaven(-s).

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for height
ruwm  (room)
(literally) elevation or (figuratively) elation -- haughtiness, height, high.

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and the earth
'erets  (eh'-rets)
the earth (at large, or partitively a land) -- common, country, earth, field, ground, land, natins, way, + wilderness, world.

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for depth
`omeq  (o'-mek)
depth -- depth.

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and the heart
leb  (labe)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect

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of kings
melek  (meh'-lek)
a king -- king, royal.

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is unsearchable
cheqer  (khay'-ker)
examination, enumeration, deliberation -- finding out, number, (un-)search(-able, -ed, out, -ing).New American Standard Bible
As the heavens for height and the earth for depth, So the heart of kings is unsearchable.

King James Bible
The heaven for height, and the earth for depth, and the heart of kings is unsearchable.

Holman Christian Standard Bible
As the heaven is high and the earth is deep, so the hearts of kings cannot be investigated.

International Standard Version
Just as the heavens are high and earth is deep, so the heart of a king is unfathomable.

NET Bible
As the heaven is high and the earth is deep so the hearts of kings are unsearchable.

Aramaic Bible in Plain English
The Heavens are high and the Earth deep, and the heart of the King is unsearchable.

GOD'S WORD® Translation
[Like] the high heavens and the deep earth, so the mind of kings is unsearchable.

King James 2000 Bible
The heaven for height, and the earth for depth, and the heart of kings is unsearchable.Proverbs 25:3
Proverbs 25:3 NIV
Proverbs 25:3 NLT
Proverbs 25:3 ESV
Proverbs 25:3 NASB
Proverbs 25:3 KJV