Reprobate according to Jeremiah 6 verse 30 simply means rejected and in context of a person it's referring to an individual who has been rejected
By God and therefore beyond the hope of salvation
That means there are people in this world that can no longer be saved
the Bible will describe them on a spectrum that ranges from sodomites all the way to false prophets and
Despite what the Calvinists teach reprobates are not born. They're made according to the Bible
We all start off as unsaved people until the gospel is given unto us some believe some don't
But then there's a subcategory of people who not only reject the gospel but actually become vehemently adversarial towards God
They begin to hate him and don't want to retain him in their knowledge
God will then assist them in their quest to reject him and remove their ability to believe
Along with their moral compass the Bible says that they're ever learning and never able to come to the knowledge of the truth
Now as Janus and Jammies wish that Moses so do these also resist the truth men of corrupt minds reprobate concern in the faith
These are people who have crossed the event horizon of the hope of salvation and are eternally damned