Reprobate... rejected. Note the Figure of speech Paronomasia (App-6). Hebrew. nim'as... ma'as: i.e. rejected (silver)... rejected (them). Compare Isaiah 1:22.Ezekiel 22:18.
Related Commentaries of Jeremiah 6:30
Jeremiah 6:30
30 Reprobatee silver shall men call them, because the LORD hath rejected them.