Strenuous
"Strenuous" in bg
енергичен
energičen
(having great vigour)
напрегнат
napregnat
(requiring great exertion)
усилен
usilen
(requiring great exertion)
усърден
usǎrden
(having great vigour)
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.