Commentaries:
Jamieson, Fausset, and Brown
obstinate—Hebrew, "hard" (Deuteronomy 9:27; Ezekiel 3:7, Margin).
iron sinew—inflexible (Acts 7:51).
brow brass—shameless as a harlot (see Jeremiah 6:28; Jeremiah 3:3; Ezekiel 3:7, Margin).
Other Jamieson, Fausset, and Brown entries containing Isaiah 48:4:
Song of Solomon 4:4
Isaiah 48:1
Jeremiah 6:28
Jeremiah 7:26
Lamentations 5:5
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