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See more synonyms for pertinacious on Thesaurus.com
  1. holding tenaciously to a purpose, course of action, or opinion; resolute.
  2. stubborn or obstinate.
  3. extremely or objectionably persistent: a pertinacious salesman from whom I could not escape.
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Origin of pertinacious

First recorded in 1620–30; pertinaci(ty) + -ous
Related formsper·ti·na·cious·ly, adverbper·ti·na·cious·ness, noun


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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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.

British Dictionary definitions for pertinaciously


  1. doggedly resolute in purpose or belief; unyielding
  2. stubbornly persistent
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Derived Formspertinaciously, adverbpertinacity (ˌpɜːtɪˈnæsɪtɪ) or 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

Word Origin and History for pertinaciously



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

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Online Etymology Dictionary, © 2010 Douglas Harper