The lips of the righteous know what is acceptable: but the mouth of the wicked speaketh forwardness.
– Proverbs 10:32
The word for acceptable means delightful and pleasant. The words of the righteous are fitting words (Proverbs 15:23; 25:11). There is beauty in them and these come from a well of wisdom (Matthew 13:52). The words of the wicked are presented in contrast. They are not few, well-chosen, nor beautiful (Proverbs 15:2, 28). They only speak frowardness, which is twistedness or perversity.