Relentless

Adjective

 * 1) Unrelenting or unyielding in severity
 * 2) Unremitting, steady and persistent

Derived terms

 * relentlessness

Thesaurus
adamant, adamantine, ardent, assiduous, bound, bound and determined, bowelless, cast-iron, ceaseless, certain, committed, constant, continual, continuing, continuous, cruel, decided, decisive, dedicated, definite, determined, devoted, diligent, dog-eat-dog, dogged, dour, earnest, enduring, energetic, faithful, fated, fateful, ferocious, fervent, fierce, firm, flinty, fundamentalist, grim, habitual, hard, hard-core, hardworking, harsh, heartless, hidebound, immovable, immutable, implacable, impliable, inalterable, incessant, inclement, indefatigable, indefeasible, indomitable, industrious, inelastic, ineluctable, inescapable, inevasible, inevitable, inexorable, inflexible, inhuman, insistent, intractable, intransigent, invincible, iron, ironbound, ironclad, ironhanded, irreconcilable, irresistible, irrevocable, laborious, lasting, loyal, merciless, mortal, muscle-bound, necessary, never idle, never-tiring, obdurate, obstinate, orthodox, patient, patient as Job, permanent, perpetual, perseverant, persevering, persistent, persisting, pertinacious, pitiless, plodding, plugging, preoccupied, procrustean, purist, puristic, puritan, puritanic, purposeful, rapt, regular, remorseless, resistless, resolute, resolved, rigid, rigorist, rigoristic, rigorous, rock-ribbed, rockbound, ruthless, sedulous, serious, sincere, single-minded, sleepless, slogging, stable, steadfast, steady, steely, stern, stiff, stiff-necked, straightlaced, straitlaced, strenuous, strict, stringent, stubborn, sure, sure as death, sure as fate, tenacious, tireless, tough, unabated, unabating, unaffected, unalterable, unappeasable, unavoidable, unbending, unbroken, unceasing, unchangeable, uncompassionate, uncompassioned, uncompromising, unconquerable, uncontrollable, undaunted, undeflectable, undeviating, undiscouraged, undrooping, unfailing, unfaltering, unfeeling, unflagging, unflinching, unforgiving, ungiving, unintermitting, uninterrupted, unmerciful, unmoved, unmoving, unnodding, unpitiful, unpitying, unpreventable, unrelaxing, unrelenting, unrelieved, unremitting, unremorseful, unsleeping, unsparing, unstoppable, unswerving, unsympathetic, unsympathizing, untiring, unwavering, unwearied, unwearying, unwinking, unyielding, utterly attentive, vehement, weariless, wholehearted, without mercy, zealous

Etymology
relent + -less

Translations

 * Catalan: implacable
 * Finnish: leppymätön, säälimätön, heltymätön
 * French: implacable
 * German: unnachgiebig
 * Italian: implacabile


 * Romanian:
 * Russian: неумолимый, непреклонный, беспощадный, безжалостный
 * Spanish: implacable


 * Dutch: voortdurend
 * Finnish: periksiantamaton, sinnikäs


 * Russian: упорный, неослабевающий
 * Spanish:, incansable