a. 无效果的

[医] 无效的, 无效力的

[ adj ]
lacking the power to produce a desired effect
<adj.all>
laws that are inefficacious in stopping crime

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.

The authority of Parliament must become inefficacious .
. . to restrain the growth of disorders. --Burke.

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.