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[pur-tn-ey-shuh s] /ˌpɜr tnˈeɪ ʃəs/
holding tenaciously to a purpose, course of action, or opinion; resolute.
stubborn or obstinate.
extremely or objectionably persistent:
a pertinacious salesman from whom I could not escape.
Origin of pertinacious
1620-30; pertinaci(ty) + -ous
Related forms
pertinaciously, adverb
pertinaciousness, noun
1. persevering. 2. dogged. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for pertinaciously
Historical Examples
  • "Depend on my zeal," cried this energetic solicitor, following Matthew pertinaciously on his way to the station.

    Hide and Seek Wilkie Collins
  • "But I think that is hardly sufficient," said Mrs. Robarts, pertinaciously.

    Framley Parsonage Anthony Trollope
  • Why, if they must err, do they err so pertinaciously in one direction?

  • "Then I'll walk a few steps with you," he said pertinaciously.

    London's Heart B. L. (Benjamin Leopold) Farjeon
  • There lay the monstrous mias, still struggling violently, while Merlin pertinaciously hung on to him.

    In the Eastern Seas W.H.G. Kingston
  • "Then he's alive," said Clarence pertinaciously, and looking at her.

    The Mandarin's Fan Fergus Hume
  • But the philosophic Kohen Gadol dared all these punishments, and pursued his way calmly and pertinaciously.

  • "We carry the worse consequences with us," said L'Isle, pertinaciously.

    The Actress in High Life Sue Petigru Bowen
  • Ellis's words returned to her again and again so pertinaciously, that she could not break from them.

    Home Influence Grace Aguilar
  • When, therefore, she so pertinaciously refused him, he could not but be angry.

    He Knew He Was Right Anthony Trollope
British Dictionary definitions for pertinaciously


doggedly resolute in purpose or belief; unyielding
stubbornly persistent
Derived Forms
pertinaciously, adverb
pertinacity (ˌpɜːtɪˈnæsɪtɪ), pertinaciousness, noun
Word Origin
C17: from Latin pertināx, from per- (intensive) + tenāx clinging, from tenēre to hold
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pertinaciously



1620s, from pertinacy (late 14c.; see pertinacity) + -ous. Related: Pertinaciously.

Online Etymology Dictionary, © 2010 Douglas Harper
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