relentless - definition and synonyms

adjective 

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/rɪˈlentləs/
  1. 1
    something bad that is relentless never seems to stop or improve

    He seems to be under relentless pressure at work.

    relentless criticism

  2. 2
    determined, and never stopping your attempts to achieve something
    relentless in:

    Arnold was relentless in his pursuit of a good news story.

derived words

relentlessness

noun [uncountable]