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adjective Inefficacious adj. Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent. "The authority of Parliament must become inefficacious... to restrain the growth of disorders." Note: Ineffectual, says Johnson, rather denotes an actual failure, and inefficacious an habitual impotence to any effect. But the distinction is not always observed, nor can it be; for we can not always know whether means are inefficacious till experiment has proved them ineffectual. Inefficacious is therefore sometimes synonymous with ineffectual.
Collaborative International Dictionary of English 0.48
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