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Adjective: tenacious  tu'ney-shus
  1. Good at remembering
    "tenacious memory";
    - retentive, recollective, long
  2. Stubbornly persisting, refusing to give up
    "a mind not gifted to discover truth but tenacious to hold it"; "men tenacious of opinion";
    - dogged, dour, persistent, pertinacious, unyielding
  3. Sticking together
    "tenacious burrs";
    - coherent

See also: adhesive, aware, mindful, obstinate, stubborn, unregenerate

Encyclopedia: Tenacious