Akademik

relentless
I adjective assiduous, bowel less, brutish, cold, cold-blooded, cold-hearted, continuous, cruel, determined, dictatorial, endless, hard, hard of heart, hardhearted, harsh, heedless, immisericors, impenitent, imperious, implacable, inclement, indefatigable, inexorabilis, inexorable, inflexible, insensitive, insistent, intolerant, intransigent, iron, merciless, obdurate, obstinate, perseverant, persevering, persistent, pertinacious, pitiless, pressing, rancorous, remorseless, resolute, rigid, ruthless, sedulous, severe, steadfast, stern, stony-hearted, stringent, stubborn, tenacious, truculent, tyrannical, unappeasable, unbending, uncompassionate, uncompromising, undaunted, undeviating, unfaltering, unfeeling, unflinching, unforgiving, unintermitting, unmerciful, unmitigable, unmoved by pity, unpitying, unrelenting, unremitting, unshrinking, unsparing, unswerving, unsympathetic, unyielding, vindictive, without regrets II index callous, close (rigorous), cold-blooded, cruel, dictatorial, diligent, draconian, faithful (diligent), immutable, implacable, inexorable, inflexible, ironclad, malicious, obdurate, patient, persistent, pertinacious, recalcitrant, remorseless, resolute, rigid, ruthless, sedulous, serious (devoted), severe, stable, steadfast, unalterable, unbending, uncompromising, unrelenting, unyielding

Burton's Legal Thesaurus. . 2006