The quality or state of being stubborn and unwilling to change your mind or listen to others.
From 'bullheaded' + '-ness' suffix, which transforms the adjective into a noun describing the abstract quality. This three-layer word formation (bull + head + -ed + -ness) shows how English builds complex meaning from simple pieces.
The '-ness' suffix is like English's favorite tool for turning feelings and qualities into countable things—you can point to someone's 'bullheadedness' as if it's an actual object, which is pretty cool when you think about it!
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