Meaning of “tireless” in the English Dictionary

"tireless" in British English

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tirelessadjective

uk /ˈtaɪə.ləs/ us /ˈtaɪr.ləs/

(Definition of “tireless” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"tireless" in American English

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tirelessadjective [ not gradable ]

us /ˈtɑɪər·ləs/

not stopping or taking a rest from something:

a tireless woman
tirelessly
adverb us /ˈtɑɪər·ləs·li/

He worked tirelessly to improve the local schools.

(Definition of “tireless” from the Cambridge Academic Content Dictionary © Cambridge University Press)