ineficaz znamená v Angličtina

ineffective▼(not having the desired effect; ineffectual)
adjective
[UK: ˌɪ.nɪ.ˈfek.tɪv] [US: ˌɪ.nə.ˈfek.tɪv]The 5% topical solution was ineffective at reducing eczema outbreaks. = La solución tópica al 5% fue ineficaz para reducir los brotes de eczema.

inefficient▼(not efficient; not producing the effect intended or desired)
adjective
[UK: ˌɪ.nɪ.ˈfɪʃnt] [US: ˌɪ.nə.ˈfɪ.ʃənt]

nugatory▼(ineffective, invalid)
adjective
[UK: ˈnjuː.ɡə.tə.ri] [US: ˈnjuː.ɡə.tə.ri]