Inefficacy
Pronunciation : In*ef"fi*ca*cy
Part of Speech : n.
Etymology : [L. inefficacia. See In- not, and Efficacy.]
Definition : Defn: Want of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the inefficacy of medicines or means. The seeming inefficacy of censures. Bp. Hall. The inefficacy was soon proved, like that of many similar medicines. James Gregory.
Source : Webster's Unabridged Dictionary, 1913