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Definition of tirelessly adverb from the Oxford Advanced Learner's Dictionary

tirelessly

adverb
 
/ˈtaɪələsli/
 
/ˈtaɪərləsli/
(approving)
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  1. in a way that involves putting a lot of hard work and energy into something over a long period of time synonym indefatigably
    • He has worked tirelessly for peace.
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