Synonyms of relentless in English:

relentless


See definition of relentless

adjective

1‘their relentless pursuit of quality’

SYNONYMS

persistent, continuing, constant, continual, continuous, non-stop, lasting, never-ending, steady, uninterrupted, unabated, unabating, unbroken, interminable, incessant, unstoppable, unceasing, endless, unending, perpetual, unremitting, unrelenting, unrelieved, sustained

unfaltering, unflagging, untiring, unwavering, unswerving, undeviating, persevering, determined, resolute, purposeful, dogged, single-minded, tireless, indefatigable, patient, diligent, assiduous, sedulous, tenacious, pertinacious, insistent, importunate

stubborn, intransigent, obstinate, obdurate

ANTONYMS

short-lived, irresolute, intermittent

2‘a relentless taskmaster’

SYNONYMS

harsh, grim, fierce, cruel, severe, strict, punishing, remorseless, merciless, pitiless, ruthless, unmerciful, unsparing, heartless, hard-hearted, hard, stony-hearted, stony, with a heart of stone, cold-blooded, cold-hearted, unforgiving, unfeeling, uncaring, unsympathetic, uncharitable, lacking compassion, unpitying

inflexible, unbending, uncompromising, obdurate, unyielding, unmoved, inexorable, implacable

ANTONYMS

lenient, merciful