In*ef"fi*ca*cy (?), n. [L. inefficacia. See In- not, and Efficacy.]

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.


© Webster 1913.