hard-headed

The compound adjective "hard-headed" is a native English formation, combining two deeply rooted Germanic elements. The first element, "hard," descends from the Proto-Germanic hardu-, meaning "hard or brave," which itself derives from the Proto-Indo-European root kar-/ker-, meaning "hard." The second element, "head," originates from Proto-Germanic haubudam, from the PIE root kaput-, meaning "head." The metaphorical use of "head" to signify the seat of intellect or will is ancient. Thus, the literal sense of "having a hard head" evolved logically to describe a person characterized by a tough, practical, and unyielding mind, resistant to sentiment or persuasion. This semantic shift from a physical description to a psychological trait is a classic example of English compounding.

Structure: hard (firm, solid) + head (mind, intellect) + ed (adjective suffix) - hard: From Old English 'heard', meaning "solid, firm, severe, difficult." In this compound, it carries the sense of "unyielding" or "tough." - head: From Old English 'hēafod', meaning "top of the body." In this compound, it is used metaphorically to mean "mind, intellect, or mental faculty." - ed: A common English suffix forming adjectives from nouns, indicating "having the qualities of" or "characterized by."