INEFFICACY

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.