deutschdictionary
adjective
(NOT ACHIEVING DESIRED RESULTS)
The project was unsuccessful. - Das Projekt war erfolglos.
(HAVING NO USEFUL RESULT)
Every effort was futile and unsuccessful. - Jede Anstrengung war erfolglos und vergeblich.
(NOT PRODUCING THE DESIRED EFFECT)
His efforts were ineffectual and unsuccessful. - Seine Bemühungen waren erfolglos und ineffektiv.
adverb
(IN A MANNER THAT DOES NOT ACHIEVE SUCCESS)
He tried to help unsuccessfully. - Er hat erfolglos versucht, zu helfen.