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