G2520–καθήκω–kathēkō

Until they heard this last statement the people listened to Paul, but now with a roar of disapproval they cried out, "Away with such a fellow from the earth! He ought not to be allowed to live."

καθῆκεν kathēken “it was proper”

And just as they had refused to continue to have a full knowledge of God, so it was to utterly worthless minds that God gave them up, for them to do things which should not be done.

καθήκοντα, kathēkonta “being proper,”