inefficacious

Synonyms for inefficacious

adj ineffectual

adjective. not working well; wasteful

1650s, from in- (1) "not, opposite of" + efficacious. Related: Inefficaciously; inefficaciousness (1640s).

Inefficacious they are not, unless they be too badly preached to obtain attention.

It was inefficacious, however, when one of these was involved in sin.

Is orthodoxy either so inefficacious or so moribund as you fancy?

But this plan of regulation was not only inefficacious, but unsafe.

And what do you think he's goin' to do with them inefficacious knick- knacks?

And what do you think he's goin' to do with them inefficacious knick-knacks?

Or if her prayers were wider must they not be inefficacious?

We have already seen how inefficacious with her are all attempts at persuasion.

Continuous discourse, either written or spoken, inefficacious as a means of instruction to the ignorant.

Many there were who believed this scheme would be inefficacious, and after events justified them.