WordReference Random House Learner's Dictionary of American English © 2025
un•flag•ging /ʌnˈflægɪŋ/USA pronunciation adj.
WordReference Random House Unabridged Dictionary of American English © 2025- not tiring, slowing, or stopping:his unflagging enthusiasm for his work.
'unflagging' also found in these entries (note: many are not synonyms or translations):