It means completely changed. Converted is not synonymous with reformed.
Reforms are from without - conversion from within.
Conversion is a complete surrender to Jesus. It's a willingness to do what he wants you to do. Unless you have made a complete surrender and are doing his will it will avail you nothing if you've reformed a thousand times and have your name on fifty church records. Believe on the Lord Jesus Christ, in your heart and confess him with your mouth and you will be saved. God is good.