iron-headed
/ˌʌɪənˈhɛdɪd/adjective
1Of a tool, weapon, or other object: having an iron head; tipped with iron.
2Designating King Charles XII of Sweden (1682–1718).
- See note in etymology..
3Hard-headed, determined, unwavering; stubborn, obstinate.
Origin
Late 16th century; earliest use found in Edmund Spenser (?1552–1599), poet and administrator in Ireland. From iron + headed.