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unsuccessful
In a sentence
Prvý pokus bol neúspešný.
The first attempt was unsuccessful.
Neúspešný pokus ich neodradil od ďalšieho tréningu.
The unsuccessful attempt did not discourage them from further training.
Projekt bol neúspešný kvôli chýbajúcim peniazom.
The project was unsuccessful due to missing funds.
Neúspešný pokus o rekord ich neodradil.
An unsuccessful record attempt did not deter them.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.