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• s  stubbornly unyielding
  the most vocal and pertinacious of all the critics

• I never read this letter even, but I know Jiang is just one more naive and pertinacious figure.
• Iowa, in that era an uplift-crusading Republican community, was no place for this pertinacious Democrat.
• They are smart, pertinacious, utterly fearless.

• dogged
• dour
• persistent
• tenacious
• unyielding

Quotes

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• Ken Jennings in Examiner.com
  Spelling is arduous,Jennings said in a statement. "You have to be pertinacious, assiduous and sometimes just plain lucky."