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