Meaning of “indefatigable” in the English Dictionary

"indefatigable" in British English

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indefatigableadjective

uk /ˌɪn.dɪˈfæt.ɪ.ɡə.bəl/ us /ˌɪn.dɪˈfæt̬.ɪ.ɡə.bəl/ formal

(Definition of “indefatigable” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"indefatigable" in American English

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indefatigableadjective

us /ˌɪn·dɪˈfæt̬·ə·ɡə·bəl/ fml

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)