Dizionario Polacco - Inglese
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nie efektywny in inglese:
1. 
ineffective
Luckily, the treatment was only ineffective instead of harmful.
A plethora of ineffective education programs made the president unpopular amongst fiscal conservatives.
Five self-help books later, Sergey still had a terribly ineffective approach to management.
It began to dawn on me that, to oppose political and social chaos, cultured means would be ineffective.
Inglese parola "nie efektywny"(ineffective) si verifica in set:
słownictwo matura2. 
ineffectual
an ineffectual remedy; ineffectual efforts; an ineffectual ruler
