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Inefficacy

From Biology-Online Dictionary | Biology-Online Dictionary
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Inefficacy

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)

Origin: L. Inefficacia. See In- not, and efficacy.