Noun
A fixedness in will, opinion, or resolution that can not be shaken at all, or only with great difficulty; firm and usually unreasonable adherence to an opinion, purpose, or system; unyielding disposition; stubborness; pertinacity; persistency; contumacy.
The quality or state of being difficult to remedy, relieve, or subdue; as, the obstinacy of a disease or evil.
Source: Webster's dictionaryObstinacy is the result of the will forcing itself into the place of the intellect. Arthur Schopenhauer
The obstinacy of cleverness and reason is nothing to the obstinacy of folly and inanity. Harriet Beecher Stowe
Obstinacy in a bad cause is but constancy in a good. Thomas Browne
One of the satisfactions of a genius is his will-power and obstinacy. Man Ray
Lawyers' robes are lined with the obstinacy of suitors. Italian Proverb
Obstinacy is the first diversion of huahine. Tahitian Proverb