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English definition of “indefatigable”

indefatigable

adjective uk   /ˌɪn.dɪˈfæt.ɪ.ɡə.bl̩/ us    /-ˈfæt̬-/ formal
always determined and energetic in trying to achieve something and never willing to admit defeat: Annie was an indefatigable campaigner for better community services.
indefatigably
adverb uk   /-bli/ us  
(Definition of indefatigable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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