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Adjective: persistent  pu(r)'sis-tunt
  1. Never-ceasing
    "the persistent beat of the drums";
    - relentless, unrelenting
  2. Stubbornly persisting, refusing to give up
    - dogged, dour, pertinacious, tenacious, unyielding
  3. Continually recurring to the mind
    "persistent memories";
    - haunting
  4. (biology) retained; not shed
    "persistent leaves remain attached past maturity"; "the persistent gills of fishes";
    - lasting
  5. (computing) of data or a data structure:existing after the execution of the program that creates it

See also: continual, obstinate, stubborn, unforgettable, unregenerate

Encyclopedia: Persistent, bioaccumulative and toxic substances