Indefatigable
"Indefatigable" in Russian
неуста́нный
neustánnyj
(extremely persistent and untiring)
неутоми́мый
neutomímyj
(extremely persistent and untiring)
упо́рный
upórnyj
(extremely persistent and untiring)
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.