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In a sentence
Na otázku odpovedala usilovne.
She answered the question diligently.
Celú úlohu dokončil usilovne.
He completed the whole task diligently.
O zmene hovorili usilovne na porade.
They spoke about the change diligently at the meeting.
Keď prišiel čas konať, zareagovali usilovne.
When it was time to act, they reacted diligently.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.