The English word perverse carries a raunchy meaning today, but in the Kings James Bible it translates a different idea.
Acts 20:28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood. 29 For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock. 30 Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them. 31 Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears.
The Greek word here is diastrepho; to distort; really to turn away toward moral corruption.
Paul is warning about grievous wolves as well as men arising out of the midst of the company of those who lead the flock. He emphasizes his warning that he has been making for three years as having been done with tears. This is not a light thing.
He warned of a similar thing in Phil 3:18 (For many walk, of whom I have told you often, and now tell you even weeping, that they are the enemies of the cross of Christ: 19 Whose end is destruction, whose God is their belly, and whose glory is in their shame, who mind earthly things.)
This does not use the word in question, but it does describe a group with the same effect.
Jesus said the same:
Matt 7:15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. 16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? 17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. 18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. 19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. 20 Wherefore by their fruits ye shall know them.
But what is diastrepho? What do the translators mean by perverse?
Jesus is quoted using the word in Matt 17:17 and Luke 9:41. He uses it in relation to the generation he found around him, perverting the truth of God and his word and overthrowing the faith of many. There is a lot to be said about this story, the follow up is that his own disciples could not cast out the afflicting devil because of unbelief. Their own understanding clouded their ability to hear the word of God as emphasized in Luke 9:45. Perverse are the words which cast doubt and strengthen unbelief.
The next time we see the word is in Luke 23:2 where it is used to describe Jesus in the Jewish leaders accusations before Pilate. The disagreement was real, the mind of man versus the word of God, the very definition of perverse; but used to slander the truth.
In Acts 13:8, 10 we see the word used of Elymas the sorcerer; he seeks to "turn away" the deputy from the faith, and it is asked of him, "wilt thou not cease to pervert the right ways of the Lord?" We see this as an example of grievous wolves, not sparing the sheep, perverting the truth continually.
Lastly we see an admonition for the positive response to stop perversity, to shine as lights in the world in the midst of the perversity. Avoid words and ways contrary to that taught by God, be the opposite of the perversity which surrounds us.
Phil 2:14 Do all things without murmurings and disputings: 15 That ye may be blameless and harmless, the sons of God, without rebuke, in the midst of a crooked and perverse nation, among whom ye shine as lights in the world; 16 Holding forth the word of life; that I may rejoice in the day of Christ, that I have not run in vain, neither laboured in vain.
Be warned against the mind of men, be strengthened in the right ways of God. Follow truth without entering into the strife of men. Do not agree with the diastrepho.
PS
The word crooked in Phil 2:15 means warped or winding; an apt description of the perverted truth that surrounds us in the world.