/ Dictionary / Index T tenacious: Meaning and Definition of Find definitions for: te•na•cious Pronunciation: (tu-nā'shus), [key] — adj. holding fast; characterized by keeping a firm hold (often fol. by of&hasp;): a tenacious grip on my arm; tenacious of old habits. highly retentive: a tenacious memory. pertinacious, persistent, stubborn, or obstinate. adhesive or sticky; viscous or glutinous. holding together; cohesive; not easily pulled asunder; tough. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tenacious (Thesaurus) tenace tenacity Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language