The quality or condition of having a broad, round head like a burr; obstinacy or stubbornness.
From burrheaded + -ness (forming abstract nouns). Can refer literally to head shape or metaphorically to stubborn behavior, similar to 'bullheadedness'.
This word shows how English connects physical traits to personality—calling someone 'burrheaded' implies they're stubborn, just like you can't easily remove a burr once it's stuck!
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