Proverbs 19:10 New English Translation

¹⁰Luxury is not appropriate^[a] for a fool;^[b]
how much less for a servant to rule over princes!^[c]

Proverbs 19:10 tn The form נָאוֶה (naʾveh) is an adjective meaning “seemly; comely” in the older English versions like KJV, ASV, “fitting” in more recent ones (e.g., NASB, NIV, NRSV). The verbal root נוֹה (noh) only occurs in the Pilel stem, but it also has the basic meaning of “being fitting; being comely.” In this sentence the form is a predicate adjective.
Proverbs 19:10 sn The verse is simply observing two things that are misfits. It is not concerned with a fool who changes and can handle wealth, or a servant who changes to become a nobleman. It is focused on things that are incongruous.
Proverbs 19:10 sn In the ancient world the prince would be trained for his rule (hence, one of the original purposes of Proverbs). A slave ruling over princes would be arrogant and cruel, or foolish and unwise. For other unbearable things, e.g., 11:22; 17:7; 26:1; 30:21-23.

New English Translation (NET)