unnecessarily, needlessly, in vain
Je me suis préparée inutilement ?
Did I prepare myself unnecessarily?
Tu t'inquiètes inutilement.
You're worrying unnecessarily.
— New York Masala (2003)
Inutilement !
In vain!
— PIKU (2015)
Nous n'allons pas perdre de temps inutilement.
We’re not going to waste time unnecessarily.