Inefficacious(a.) Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent.
Inefficaciously(adv.) without efficacy or effect.
Inefficaciousness(n.) Want of effect, or of power to produce the effect; inefficacy.
Inefficacy(n.) Want of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the inefficacy of medicines or means.
Words within inefficacy