Definition of "iron-headed" [iron-headed]

• Fitted with an iron head or tip, as a spade or a nail.
• Determined; stubborn; resolute; hard-headed.

The Century Dictionary (Public Domain)

• "I don't care how iron-headed you like to think you are."
• "It continues to rely on faux-naive phrasing ( "a very gently boy," "played quietly") and an altogther formulaic plot -- the iron-headed boy dies, of course, leaving everyone very sad."
• "Had he, in his trouble, been drinking with the iron-headed Terrence down in the stag room?"