Definition of relentless adjective from the Oxford Advanced American Dictionary

     

    relentless

     adjective
    adjective
    NAmE//rɪˈlɛntləs//
     
     
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  1. 1not stopping or getting less strong synonym unrelenting her relentless pursuit of perfection The sun was relentless.
  2. 2refusing to give up or be less strict or severe a relentless enemy
relentlessly
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: relentless