inefficacious

adjective
ˌɪn.ɪ.fɪˈkeɪ.ʃəs

Meaning

Not producing any or the desired effect; ineffective.

Example Sentences

The treatment was inefficacious in curing the disease.

Synonyms

ineffective, futile, useless

Antonyms

effective, powerful, productive

Related Vocabularies

Done without formality or courtesy; abrupt or rude.
Lasting for only a limited period of time; not permanent.
working well without waste; competent; productive
Having the ability to create or design new things or to think originally.
Relating to or involving technology
actually existing or happening; true and not imagined

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