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Adjective: unrelenting  ,ún-ri'len-ting
  1. Not to be placated, appeased or moved by entreaty
    "unrelenting determination";
    - grim, inexorable, relentless, stern, unappeasable, unforgiving
  2. Punishingly harsh
    "the unrelenting summer sun";
    - brutal
  3. Never-ceasing
    "the unrelenting beat of the drums";
    - persistent, relentless

See also: continual, implacable, intense

Encyclopedia: Unrelenting