The Bible has much to say regarding the wise and the foolish. There is one chapter that is dedicated entirely to "The Fool", that chapter is Proverbs 26.
I encourage you to study the chapter for yourself, but here's 7 bullet points defining a fool, followed up by 7 bullet points to keep from being a fool:
Defining a fool:
-A fool doesn't listen to instruction
-A fool is prideful
-A fool is lazy
-A fool is a drunk
-A fool doesn't learn from his mista