pitiless

UK: /ˈpɪtiləs/ US: /ˈpɪtɪlɪs, ˈpɪti-/ ,(pit′i lis, pit′ē-)

WordReference Random House Learner's Dictionary of American English © 2025

pit•i•less /ˈpɪtɪlɪs, ˈpɪti-/   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 © 2025

pit•i•less  (pit′i lis, pit′ē-), adj. 

1. feeling or showing no pity;
   merciless:
   pitiless criticism of his last novel.

• late Middle English piteles. See pity, -less 1375–1425

pit′i•less•ly, adv. 
pit′i•less•ness, n. 
Synonyms

unmerciful, implacable, relentless. See cruel. 

Antonyms

merciful.

Collins Concise English Dictionary © HarperCollins Publishers::

pitiless / ˈpɪtɪlɪs/ adjective

1. having or showing little or no pity or mercy

ˈpitilessly adverb

ˈpitilessness noun