Did you know that "foolishness" is listed together with adultery, murder, blasphemy and other sins? (Mark 7:20-23) According to verse twenty-three, foolishness is evil! Possibly in a later post I'll define what foolishness is Biblically, but for now we can be sure it is the opposite of wisdom!
Consider this verse: "Dead flies putrefy the perfumer's ointment, And cause it to give off a foul odor; So does a little folly to one respected for wisdom and honor." Ecclesiastes 10:1
Just a personal thought: there are some things that others would call silly or fun but may actually fall into the category of foolishness!
For the wisdom of this world is foolishness with God.
I Corinthians 3:19
I Corinthians 3:19