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Adjective relentless has 2 senses
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)
 
persistent, relentless, unrelenting - never-ceasing; "the relentless beat of the drums"Antonym:  sporadic (indirect, via continual)
 
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