relentless

I

(New American Roget's College Thesaurus)

adj. pitiless, merciless, implacable, remorseless; inexorable, indefatigable. See resolution, retaliation, severity.

II

(Roget's IV) modif.

Syn. implacable, unmerciful, harsh, unremitting; see constant 1 , cruel 2 , remorseless 2 , ruthless 1 , 2 .

III

(Roget's 3 Superthesaurus) (VOCABULARY WORD) a.

[ri LENT liss]

unremitting, incessant, pitiless.

The enemy bunkers took a relentless pounding.

SYN.: unremitting, incessant, persistent, sustained, pitiless, merciless, unrelenting, hard, cruel, unflagging.

ANT.: relenting, brief, mercifully short, sparing

IV

(Roget's Thesaurus II) adjective 1. Firmly, often unreasonably immovable in purpose or will: adamant, adamantine, brass-bound, die-hard, grim, implacable, incompli-ant, inexorable, inflexible, intransigent, iron, obdurate, remorseless, rigid, stubborn, unbend-able, unbending, uncompliant, uncompromising, unrelenting, unyielding. Idiom: stubborn as a mule (or ox). See RESIST. 2. Existing or occurring without interruption or end: around-the-clock, ceaseless, constant, continual, continuous, endless, eternal, everlasting, incessant, interminable, nonstop, ongoing, perpetual, persistent, round-the-clock, timeless, unceasing, unending, unfailing, uninterrupted, unremitting. See CONTINUE.