Learn more Meaning of indefatigable in English indefatigable adjective • formal US /ˌɪn.dɪˈfæt̬ .ɪ.ɡə.bəl / UK /ˌɪn.dɪˈfæt.ɪ.ɡə.bəl / Add to word list always determined and energetic in trying to achieve something and never willing to admit defeat: • Annie was an indefatigable campaigner for better community services. Synonyms tireless unflagging SMART Vocabulary: related words and phrases Energetic and lively alive astir barnstorming be alive and well/kicking idiom be as fresh as a daisy idiom be full of beans idiom boisterous crackling freshness friskily frisky frolicsome fury re-energize refreshed refreshingly rejuvenate rejuvenation zestily zesty See more results » ➜ Want to learn more? Improve your vocabulary with English Vocabulary in Use from Cambridge. Learn words you need to communicate with confidence. Related word indefatigably (Definition of indefatigable from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press) indefatigable | INTERMEDIATE ENGLISH indefatigable adjective • fml US /ˌɪn·dɪˈfæt̬ ·ə·ɡə·bəl / Add to word list never becoming tired: • For many years Annie has been an indefatigable campaigner for human rights. (Definition of indefatigable from the Cambridge Academic Content Dictionary © Cambridge University Press) EXAMPLES of indefatigable indefatigable He engaged in indefatigable public campaigning to build support for his view of the law. From Huffington Post On one side, we see an exhausted but indefatigable vigilante, half-armed, bleeding, possibly half-crazed. From TIME She brought with her a restless enthusiasm and an indefatigable drive. From The New Yorker This man was an indefatigable hoarder and buyer. From NPR I marvel at a certain hospital employee's cheerful disposition and indefatigable smile. From Huffington Post These days, she seems indefatigable. From OregonLive.com Moreover, he has been indefatigable in his pursuit of relevant works, and has shown a true genius for detecting observations of value in otherwise obscure and ill-conceived studies. From the Cambridge English Corpus The painstaking endeavor and indefatigable effort which belonged to his labor in industry was equally a part of his labor in education. From Project Gutenberg The most indefatigable, persistent, unrelenting, and unyielding, to any obstacle, is the naturalist. From Project Gutenberg Happily, the fever was subdued, and he again, with indefatigable diligence, resumed his labors. From Project Gutenberg There is, among my patients, a retired merchant, one who has been able, by indefatigable industry in trade, to amass a very handsome fortune. From Project Gutenberg They were indefatigable in trying to evangelize the prison. From Project Gutenberg No act of injustice or oppression could escape his indefatigable inquiries. From Project Gutenberg The ladies who originated and sustained it were indefatigable in their labors, and the benevolent public gave them their heartiest sanction. From Project Gutenberg This slender, undersized officer, in spite of his physique, seemed indefatigable. From Project Gutenberg These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. What is the pronunciation of indefatigable? Translations of indefatigable in Chinese (Traditional) 不倦的, 不屈不撓的… See more in Chinese (Simplified) 不倦的, 不屈不挠的… See more in Portuguese infatigável… See more in more languages Need a translator? Get a quick, free translation! Translator tool Browse indecorous indecorously indecorum indeed indefatigable indefatigably indefeasible indefectible indefensible Test your vocabulary with our fun image quizzes Image credits Try a quiz now BLOG Now you’re talking! Phrases with the verb ‘talk’ August 02, 2023 Read More To top Contents LEARN DEVELOP ABOUT © Cambridge University Press & Assessment 2023