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Definition of inefficacy:

  1. Want of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the inefficacy of medicines or means.

Synonyms:

inadequacy, strong, inefficaciousness, incapability, ineffectiveness, helplessness, uselessness, impotence, powerlessness, ineffectuality, ineffectualness, affect.

Usage examples: