Definition of tireless adjective from the Oxford Advanced Learner's Dictionary

 

tireless

 adjective
adjective
BrE BrE//ˈtaɪələs//
 
; NAmE NAmE//ˈtaɪərləs//
 
(approving) Energetic
 
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putting a lot of hard work and energy into something over a long period of time synonym indefatigable a tireless campaigner for human rights to have tireless energy She was tireless in her efforts on our behalf. See related entries: Energetic
See the Oxford Advanced American Dictionary entry: tireless