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.

Nearby words

  1. perth and kinross,
  2. perthes disease,
  3. perthite,
  4. perthitic,
  5. perthshire,
  6. pertinacity,
  7. pertinence,
  8. pertinent,
  9. pertly,
  10. perturb

Origin of pertinacious

First recorded in 1620–30; pertinaci(ty) + -ous

Related formsper·ti·na·cious·ly, adverbper·ti·na·cious·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pertinaciously

British Dictionary definitions for pertinaciously



doggedly resolute in purpose or belief; unyielding
stubbornly persistent
Derived Formspertinaciously, adverbpertinacity (ˌpɜːtɪˈnæsɪtɪ) or pertinaciousness, noun

Word Origin for pertinacious

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.

Online Etymology Dictionary, © 2010 Douglas Harper