"Inefficacious" is a word in ENGLISH

Efficacious against catarrh.

Efficacious in curing toothache.

Efficacious in preventing or allaying fever.

Efficacious against syphilis.

In an available manner; profitably; advantageously; efficaciously.

To be of use or advantage; to answer the purpose; to have strength, force, or efficacy sufficient to accomplish the …

Having sufficient power, force, or efficacy, for the object; effectual; valid; as, an available plea.

Competent power; validity; efficacy; as, the availableness of a title.

To annul; cancel; make void; to destroy the efficacy of anything

A shrub of the genus Berberis, common along roadsides and in neglected fields. B. vulgaris is the species best known; …

Anything worn for its supposed efficacy to the wearer in averting ill or securing good fortune.

Joint efficacy.

Diminution or reduction of strength, efficacy, or value; degeneration; deterioration.

Acting rapidly and violently; efficacious; powerful; -- opposed to bland; as, drastic purgatives.

With effect; efficaciously.

Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; as, an efficacious law.

Efficacy.

Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy …

Exhibiting energy; operating with force, vigor, and effect; forcible; powerful; efficacious; as, energetic measures; energetic laws.

One of various plants, supposed to have efficacy in driving away fleas. They belong, for the most part, to the …