Bullheadedness

/ˈbʊlˌhɛdɪdnəs/ noun

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.

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