noun, plural obstinacies for 5.
the quality or state of being obstinate; stubbornness.
unyielding or stubborn adherence to one's purpose, opinion, etc.
stubborn persistence: The garrison fought on with incredible obstinacy.
resistance to cure, relief, or treatment, as a disease.
an instance of being obstinate; an obstinate act, viewpoint, etc.

1350–1400; Middle English < Medieval Latin obstinātia, derivative of Latin obstinātus (see obstinate); see -cy

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World English Dictionary
obstinacy (ˈɒbstɪnəsɪ)
n , pl -cies
1.  the state or quality of being obstinate
2.  an obstinate act, attitude, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., from M.L. obstinatia, from obstinatus (see obstinate).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Besides, that obstinacy needs to be properly tested.
Likewise, teachers should not pin the blame for a failure to convince the
  student merely on the obstinacy of the student.
If necessary, a little imagination and obstinacy can turn any place into a
Were the consequences not so great, it would be a respectable form of obstinacy.
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