Inefficacious

In*ef`fi*ca"cious

(?), a. [Pref. in- not + efficacious: cf. F. inefficace, L. inefficax.] Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent. Boyle.
[1913 Webster]

The authority of Parliament must become inefficacious . . . to restrain the growth of disorders.
Burke.
[1913 Webster]

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.
[1913 Webster]

 

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Tue 11th December 2018