relentless

relent +‎ -less

• IPA^(key): /ɹɪˈlɛntləs/

  • Audio (Southern England)

    (file)

relentless (comparative more relentless, superlative most relentless)

1. Unrelenting or unyielding in severity.
   • 1930, Norman Lindsay, Redheap, Sydney: Ure Smith, published 1965, page 111:

     She sniffed, too, comprehendingly, and fixed her son with a relentless eye.

2. Unremitting, steady and persistent.
   • 2016 January 31, "Is Huma Abedin Hillary Clinton’s Secret Weapon or Her Next Big Problem?," Vanity Fair (retrieved 21 January 2016):

     In Clintonworld, the reaction to Grassley’s relentless assault on Huma is one of resignation.

• relentlessness