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 formsper·ti·na·cious·ly, adverbper·ti·na·cious·ness, noun

Synonyms for pertinacious Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for pertinacious

Historical Examples of pertinacious

  • And it was the presence of that pertinacious ship-chandler which had started them.

  • Behind these was the agent, punctual and pertinacious, who had come for the rent.

    The Paliser case

    Edgar Saltus

  • And he escaped from pertinacious Mr. Dawson with some alacrity.

    Half a Hero

    Anthony Hope

  • Again they laughed at the child's pertinacious fancy for a night-ramble.

    Short Story Writing

    Charles Raymond Barrett

  • "They are not the only pertinacious ones," the priest replied.

    The Art of Disappearing

    John Talbot Smith

British Dictionary definitions for pertinacious



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 pertinacious

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

Online Etymology Dictionary, © 2010 Douglas Harper