relentless

Etymology

relent + -less

adj

  1. Unrelenting or unyielding in severity.
  2. Unremitting, steady and persistent.
    In Clintonworld, the reaction to Grassley’s relentless assault on Huma is one of resignation. January 31 2016, “Is Huma Abedin Hillary Clinton’s Secret Weapon or Her Next Big Problem?”, in Vanity Fair, retrieved 2016-01-21

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