Etymology
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tenacious (adj.)

c. 1600, from Latin stem of tenacity + -ous. Related: Tenaciously; tenaciousness.

updated on January 20, 2014

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Definitions of tenacious from WordNet

tenacious (adj.)
stubbornly unyielding; "a mind not gifted to discover truth but tenacious to hold it"- T.S.Eliot;
men tenacious of opinion
tenacious (adj.)
sticking together;
tenacious burrs
Synonyms: coherent
tenacious (adj.)
good at remembering;
tenacious memory
Synonyms: retentive / recollective / long
From wordnet.princeton.edu, not affiliated with etymonline.