Artificial intelligent assistant

iron-headed

ˈiron-headed, a.
  (-ˌhɛdɪd)
  1. Having an iron head; tipped with iron.

1588 Spenser Virg. Gnat 653 His yron-headed spade tho making cleene, To dig up sods out of the flowrie grasse. 1697 Dryden Virg. Georg. ii. 233 Volscians arm'd with Iron-headed Darts. 1820 Scott Abbot x, A door well clenched with iron-headed nails.

  2. fig. Very hard-headed or determined.

1852 Mundy Our Antipodes (1857) 126 The burly baron of feudal times..those iron-clad, iron-fisted, and iron-headed nobles despised all manner of clerk-craft.

Oxford English Dictionary

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