tireless

(tīr'lĭs)
adj.
Not yielding to fatigue; untiring or indefatigable.

tirelessly tire'less·ly adv.
tirelessness tire'less·ness n.

SYNONYMS   tireless, indefatigable, unflagging, untiring, unwearied, weariless. These adjectives mean having or showing a capacity for prolonged and laborious effort: a tireless worker; an indefatigable advocate of human rights; unflagging pursuit of excellence; untiring energy; an unwearied researcher; a weariless defender of freedom of the press.

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adjective

Having or showing a capacity for protracted effort, regardless of difficulty or frustration: indefatigable, inexhaustible, unfailing, unflagging, untiring, unwearied, weariless. See continue/stop/pause, tired/fresh.

adj

Definition: determined
Antonyms: beat, tired, unenthusiastic, weary, worn out

For a list of words related to tireless, see:

• Active, Lively, Awake, or Limber
• Demanding, Critical, Calculating, or Selfish

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Dansk (Danish)
adj. - utrættelig

Nederlands (Dutch)
onvermoeibaar

Français (French)
adj. - inlassable, infatigable, constant (recherche)

Deutsch (German)
adj. - unermüdlich

Ελληνική (Greek)
adj. - ακούραστος, ακαταπόνητος, άοκνος

Italiano (Italian)
instancabile

Português (Portuguese)
adj. - incansável, infatigável

Русский (Russian)
неутомимый

Español (Spanish)
adj. - incansable, infatigable

Svenska (Swedish)
adj. - outtröttlig

中文（简体）(Chinese (Simplified))
不疲倦的, 不屈不挠的, 不厌倦的

中文（繁體）(Chinese (Traditional))
adj. - 不疲倦的, 不屈不撓的, 不厭倦的

한국어 (Korean)
adj. - 지칠 줄 모르는, 근면한, 꾸준한

日本語 (Japanese)
adj. - 疲れを知らない, 疲れの見えない, タイヤのない, 疲れない, 不断の

العربيه (Arabic)
‏(صفه) متواصل لا يتعب‏

עברית (Hebrew)
adj. - ‮לא יודע ליאות, מתמיד‬

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