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

 

tirelessly

 adverb
adverb
BrE BrE//ˈtaɪələsli//
 
; NAmE NAmE//ˈtaɪərləsli//
 
(approving)
 
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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.