relentless 9 antonyms and opposites of relentless. Adjective — Continuing without pause or weakening; unyielding. Synonyms for relentless bateless grim incontestable inexorable invincible irresistible overpowering overwhelming potent puissant persistent unrelenting unremitting unstoppable unyielding Antonyms for relentless contestable exorable impotent relenting remitting underwhelming stoppable vincible yielding ← Back to the full definition of relentless
