relentless

Adjective
  1. Not to be placated or appeased or moved by entreaty (synset 301789850)
    "grim determination"; "grim necessity"; "Russia's final hour, it seemed, approached with inexorable certainty"; "relentless persecution"; "the stern demands of parenthood"
  2. Never-ceasing (synset 300595708)
    "the relentless beat of the drums"

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