unsuccessfully
BrE /ʌnˈsʌksesflɪ/ AmE /ʌnˈsʌksəsfli/
adverb en → es
in a way that does not succeed or achieve the desired result
sin éxito, infructuosamente
Collocations unsuccessfully attempt to do something · an unsuccessful business venture
-
He tried unsuccessfully to contact her.
Él intentó sin éxito ponerse en contacto con ella.