01 n. Lack of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the ineffic…
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Lack 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.