The quality of being stubborn and refusing to listen to other people's opinions or advice.
From 'bullet-headed,' meaning having a round head like a bullet, which was used figuratively since the 1800s to describe someone rigid and inflexible in thinking. The suffix '-ness' transforms the adjective into an abstract noun.
This word perfectly captures how physical descriptions become personality traits—calling someone 'bullet-headed' works because bullets are hard, dense, and won't bend, just like a stubborn mind won't budge!
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