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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
First recorded in 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. 2017.
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Examples from the Web for pertinaciously
Historical Examples
  • Other substances he found that it would consume slowly, but pertinaciously.

    In the Morning of Time Charles G. D. Roberts
  • "But I think that is hardly sufficient," said Mrs. Robarts, pertinaciously.

    Framley Parsonage

    Anthony Trollope
  • For a long time, and most pertinaciously, this idea dwelt with her.

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

    London's Heart B. L. (Benjamin Leopold) Farjeon
  • If they are not defended perseveringly and pertinaciously, I will not combat them strongly.

  • He is afraid that this is one of the aspects of her that will stick most pertinaciously in his memory.

    Alas! Rhoda Broughton
  • Ellis's words returned to her again and again so pertinaciously, that she could not break from them.

    Home Influence Grace Aguilar
  • "Then he's alive," said Clarence pertinaciously, and looking at her.

    The Mandarin's Fan Fergus Hume
  • And, if ill-trained, how pertinaciously it will refuse to do anything it ought!

    Household Education Harriet Martineau
  • Why, if they must err, do they err so pertinaciously in one direction?

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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