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RELENTLESS definition: 1. continuing in a severe or extreme way: 2. continuing in a severe or extreme way: 3. continuing…. Learn more. The meaning of RELENTLESS is showing or promising no abatement of severity, intensity, strength, or pace : unrelenting . How to use relentless in a sentence. Definition of relentless adjective from the Oxford Advanced Learner's Dictionary. not stopping; not getting less strong synonym unrelenting. The sun was relentless. His relentless energy made him come alive in every role he played. She tried to force her way into the relentless stream of traffic. Define relentless. relentless synonyms, relentless pronunciation, relentless translation, English dictionary definition of relentless. adj. 1. Unyielding in severity or strictness; unrelenting: relentless persecution.