UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈpɪtiləs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈpɪtɪlɪs, ˈpɪti-/ ,USA pronunciation: respelling(piti lis, pitē-)

WordReference Random House Learner's Dictionary of American English © 2020
pit•i•less /ˈpɪtɪlɪs, ˈpɪti-/USA pronunciation   adj. 
  1. feeling or showing no pity;
    merciless:a pitiless foe.
pit•i•less•ly, adv.: His forces attacked pitilessly.

WordReference Random House Unabridged Dictionary of American English © 2020
pit•i•less  (piti lis, pitē-),USA pronunciation adj. 
  1. feeling or showing no pity;
    merciless:pitiless criticism of his last novel.
piti•less•ly, adv. 
piti•less•ness, n. 
  • late Middle English piteles. See pity, -less 1375–1425
    unmerciful, implacable, relentless. See  cruel. 

Collins Concise English Dictionary © HarperCollins Publishers::
pitiless /ˈpɪtɪlɪs/ adj
  1. having or showing little or no pity or mercy

ˈpitilessly adv ˈpitilessness n
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