ineffective
US /ˌɪn.ɪˈfek.tɪv/
UK /ˌɪn.ɪˈfek.tɪv/

1.
ineficaz, ineficiente
not producing any significant or desired effect
:
•
The new policy proved to be ineffective in reducing crime.
A nova política provou ser ineficaz na redução do crime.
•
His efforts to persuade her were completely ineffective.
Seus esforços para persuadi-la foram completamente ineficazes.