Obstinacy
/ˈɑbstənəsi/
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Definition
(noun) The state, or an act, of stubbornness or doggedness.
Sentence Examples
There was a certain obstinacy in his voice.
The obstinacy of sisters-in-law.
CEFR Practice Quiz
His sheer ____ made it impossible for him to admit he was wrong, even in the face of proof.