Adjective tenacious has 3 senses
  1. bulldog, dogged, dour, pertinacious, tenacious, unyielding - stubbornly unyielding; "dogged persistence"; "dour determination"; "the most vocal and pertinacious of all the critics"; "a mind not gifted to discover truth but tenacious to hold it"- T.S.Eliot; "men tenacious of opinion"
    Antonym: docile (indirect, via stubborn)
  2. long, tenacious - (of memory) having greater than average range; "a long memory especially for insults"; "a tenacious memory"
    Antonyms: unretentive, forgetful (indirect, via retentive)
  3. coherent, tenacious - sticking together; "two coherent sheets"; "tenacious burrs"
    Antonym: nonadhesive (indirect, via adhesive)
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