New Revised Standard Version
Fine speech is not becoming to a fool; still less is false speech to a ruler.

Contemporary English Version
It sounds strange for a fool to talk sensibly, but it's even worse for a ruler to tell lies.

New American Bible
Fine words ill fit a fool; how much more lying lips, a noble!

Douay-Rheims Bible
Eloquent words do not become a fool, nor lying lips a prince.

Eloquent words do not become a fool, nor lying lips a prince.

excellent speech

Proverbs 26:7 As a lame man hath fair legs in vain: so a parable is unseemly in the mouth of fools.

Psalm 50:16,17 But to the sinner God hath said: Why dost thou declare my justices, and take my covenant in thy mouth? . . .

much

Proverbs 16:10-13 Divination is in the lips of the king, his mouth shall not err in judgment. . . .

Proverbs 29:12 A prince that gladly heareth lying words, hath all his servants wicked.

2 Samuel 23:3 The God of Israel said to me, the strong one of Israel spoke, the ruler of men, the just ruler in the fear of God.

Job 34:12 For in very deed God will not condemn without cause, neither will the Almighty pervert judgment.

Psalm 101:3-5 I will not set before my eyes any unjust thing: I hated the workers of iniquities. . . .

lying lips

Proverbs 12:19 The lip of truth shall be steadfast for ever: but he that is a hasty witness, frameth a lying tongue.