Meaning of “untiring” in the English Dictionary

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"untiring" in American English

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untiringadjective

us /ʌnˈtɑɪər·ɪŋ/

(esp. of qualities such as energy, interest, and enthusiasm) never weakening:

Without Tony’s untiring enthusiasm, this campaign would not have succeeded.

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