Adjective relentless has 2 senses
  1. grim, inexorable, relentless, stern, unappeasable, unforgiving, unrelenting - not to be placated or appeased or moved by entreaty; "grim determination"; "grim necessity"; "Russia's final hour, it seemed, approached with inexorable certainty"; "relentless persecution"; "the stern demands of parenthood"
    Antonym: placable (indirect, via implacable)
  2. persistent, relentless, unrelenting - never-ceasing; "the relentless beat of the drums"
    Antonym: sporadic (indirect, via continual)
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