unrelenting

UK: /ˌʌnrɪˈlɛntɪŋ/ US: /ˌʌnrɪˈlɛntɪŋ/ ,(un′ri len′ting)

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

un•re•lent•ing /ˌʌnrɪˈlɛntɪŋ/   adj. 

1. not relenting;
   not losing desire to continue.
2. not easing or becoming reduced, as in intensity:
   unrelenting poverty.

WordReference Random House Unabridged Dictionary of American English © 2025

un•re•lent•ing  (un′ri len′ting), adj. 

1. not relenting;
   not yielding or swerving in determination or resolution, as of or from opinions, convictions, ambitions, ideals, etc.;
   inflexible:
   an unrelenting opponent of the Equal Rights Amendment.
2. not easing or slackening in severity:
   an unrelenting rain.
3. maintaining speed, effort, vigor, intensity, rate of advance, etc.:
   an unrelenting attack.

• un-¹ + relent + -ing² 1580–90

un′re•lent′ing•ly, adv. 
un′re•lent′ing•ness, n. 
Synonyms

• 1. relentless, merciless, unmerciful, ruthless, pitiless, cruel, remorseless.
• 2. unremitting, implacable, inexorable.

Collins Concise English Dictionary © HarperCollins Publishers::

unrelenting / ˌʌnrɪˈlɛntɪŋ/ adjective

1. refusing to relent or take pity; relentless; merciless
2. not diminishing in determination, speed, effort, force, etc

ˌunreˈlentingly adverb

ˌunreˈlentingness noun