Tàn nhẫn, không thương xót

Không ngơi ngớt, không nao núng; nghiêm khắc, gay gắt

to be relentless in doing something

làm việc gì hăng say không hề nao núng

Không ngừng; luôn luôn, thường xuyên

driven by a relentless urge

được thúc đẩy bởi một sự thôi thúc

Unyielding, inexorable, unstoppable, unrelenting,dogged, implacable, inflexible, unbending, unmoving, unmoved,unrelieved, stiff, hard, stiff-necked, rigid, obstinate,adamant, obdurate, intransigent, determined, unswerving,undeviating, intractable, persevering, steely, tough,intransigent, unsparing, uncompromising, pitiless, unforgiving,ruthless, merciless, cruel, unmerciful, remorseless: The novelis about the relentless horde of Mongols that swept acrossEurope in the 13th century. 2 non-stop, persistent, incessant,unrelenting, unremitting, unstoppable, perpetual, unfaltering,unfailing, unflagging, unrelieved, unabated, unrelieved,unbroken, continual, continuous, ceaseless, constant, unceasing,steady, habitual, regular: Won't you ever stop your relentlessnagging?

Unrelenting; insistent and uncompromising.

Continuous; oppressively constant (the pressure was relentless).

Relentlessly adv. relentlessness n.