Etymology
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obstinacy (n.)

late 14c., obstinacie, "hardness of heart, inflexibility of temper or purpose," from Medieval Latin obstinatia, from obstinatus "resolute, inflexible, stubborn" (see obstinate).

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Definitions of obstinacy

obstinacy (n.)
the trait of being difficult to handle or overcome;
Synonyms: stubbornness / obstinance / mulishness
obstinacy (n.)
resolute adherence to your own ideas or desires;
Synonyms: stubbornness / bullheadedness / obstinance / pigheadedness / self-will
From wordnet.princeton.edu