/ Dictionary / Index P pertinacious: Meaning and Definition of Find definitions for: per•ti•na•cious Pronunciation: (pûr"tn-ā'shus), [key] — adj. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pertinacious (Thesaurus) Perthshire pertinacity Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language