noun

stubbornness

stubbornness, obstinacy

His stubbornness is his worst quality.

His stubbornness is his worst quality.

Their stubbornness led to the project's failure.

Their stubbornness led to the project's failure.

((sb.'s)) stubbornness the quality of being stubborn His stubbornness is a problem.

Synonyms: obstinacy, pigheadedness; Antonyms: flexibility, adaptability

From the adjective 'stubborn' plus the suffix '-ness', which forms nouns indicating a state or quality.

It's the state of being 'stubborn'. The '-ness' suffix turns the adjective into a noun.

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