unrelenting - definition and synonyms

adjective 

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/ˌʌnrɪˈlentɪŋ/
  1. used for describing someone who continues to do something with a lot of determination

    They have been unrelenting in their support for the local community.

    1. b.
      used about bad or extreme things that continue to happen or exist without ever becoming easier to deal with

      unrelenting heat/wind/pressure