ESV: Because I know that you are obstinate, and your neck is an iron sinew and your forehead brass,
NIV: For I knew how stubborn you were; your neck muscles were iron, your forehead was bronze.
NASB: Because I know that you are obstinate, And your neck is an iron tendon And your forehead bronze,
CSB: Because I know that you are stubborn, and your neck is iron and your forehead bronze,
NLT: For I know how stubborn and obstinate you are. Your necks are as unbending as iron. Your heads are as hard as bronze.
KJV: Because I knew that thou art obstinate, and thy neck is an iron sinew, and thy brow brass;
NKJV: Because I knew that you were obstinate, And your neck was an iron sinew, And your brow bronze,