indefatigable

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indefatigable /ˌɪndɪˈfætɪgəbəl/ adjective
indefatigable
/ˌɪndɪˈfætɪgəbəl/
adjective
Learner's definition of INDEFATIGABLE
[more indefatigable; most indefatigable] formal
: able to work or continue for a very long time without becoming tired : tireless

— indefatigably

/ˌɪndɪˈfætɪgəbli/ adverb