adj.

1. Unyielding in severity or strictness; unrelenting: relentless persecution.
2. Steady and persistent; unremitting: the relentless beat of the drums.

relentlessly re·lent'less·ly adv.
relentlessness re·lent'less·ness n.

adjective

1. Firmly, often unreasonably immovable in purpose or will: adamant, adamantine, brassbound, die-hard, grim, implacable, incompliant, inexorable, inflexible, intransigent, iron, obdurate, remorseless, rigid, stubborn, unbendable, unbending, uncompliant, uncompromising, unrelenting, unyielding. Idioms: stubborn as amuleox. See resist/yield.
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/stop/pause.

adj

Definition: continuous, never-ending
Antonyms: ending, intermittent, short-lived, stopping

adj

Definition: cruel, merciless
Antonyms: kind, lenient, merciful, sympathetic, understanding

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Dansk (Danish)
adj. - uforsonlig, ubarmhjertig, hård, ubøjelig

Nederlands (Dutch)
meedogenloos, gestadig

Français (French)
adj. - implacable, incessant, acharné, inexorable

Deutsch (German)
adj. - erbarmungslos

Ελληνική (Greek)
adj. - ανένδοτος, αδιάλλακτος, αμείλικτος, ανελέητος, άκαμπτος

Italiano (Italian)
spietato

Português (Portuguese)
adj. - inflexível

Русский (Russian)
неумолимый, безжалостный

Español (Spanish)
adj. - implacable, incesante, despiadado

Svenska (Swedish)
adj. - obeveklig

中文（简体） (Chinese (Simplified))
无情的, 残酷的, 冷酷的

中文（繁體） (Chinese (Traditional))
adj. - 無情的, 殘酷的, 冷酷的

한국어 (Korean)
adj. - 잔인한, 가차없는

日本語 (Japanese)
adj. - 容赦のない, 厳しい, 執拗な

العربيه (Arabic)
‏(صفه) قاس, , لا يلين‏

עברית (Hebrew)
adj. - ‮לא מתפשר, אכזרי, מתמשך, קשוח, קשה‬

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