What is the meaning of the word "tenacious"?

Definitions:

  1. good at remembering copy to clipboard adjective
    • My memory is tenacious, so don't try and fool me. copy to clipboard
  2. sticking together copy to clipboard adjective
    • They made a tenacious pair. copy to clipboard
  3. stubbornly unyielding copy to clipboard adjective
    • The students responses were so tenacious, that they often landed them in trouble at school. copy to clipboard

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