The primary characteristic of the fool seems to be that he will not learn, so this gets a subsection of its own. Leave the company of ignorant people, and live. Sensible people will ignore an insult. If you make friends with stupid people, you will be ruined. Intelligent people want to learn, but stupid people are satisfied with ignorance.
Good people think before they answer.
Evil people have a quick reply, and it causes trouble. A wise, mature person is known for his understanding. The more pleasant his words, the more persuasive he is. A fool doing some stupid thing a second time is like a dog going back to its vomit. Sensible people will see trouble coming and avoid it, but an unthinking person will walk right into it and regret it later.