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

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.

without efficacy or effect.

Want of effect, or of power to produce the effect; inefficacy.

Efficacious against catarrh. -- n.

Efficacious in curing toothache. -- n.

Efficacious in preventing or allaying fever. -- n.

Efficacious against syphilis. -- n.

In an available manner; profitably; advantageously; efficaciously.

est known; its oblong red berries are made into a preserve or sauce, and have been deemed efficacious in fluxes and fevers. The bark dyes a fine yellow, esp. the bark of the root. [Also spelt berberry.]

contemning authority; obstinate; perverse; stubborn; disobedient. There is another very, efficacious method for subding the most obstinate, contumacious sinner. Hammond.

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

With effect; efficaciously.

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

Possessing force; characterized by force, efficiency, or energy; powerful; efficacious; impressive; influential. How forcible are right words! Job. vi. 2 Sweet smells are most forcible in dry substances, when broken. Bacon. But I have reasons strong and forcible. Shak. That punishment which hath been sometimes forcible…

Not efficient; not producing the effect intended or desired; inefficacious; as, inefficient means or measures.

Exerting or possessing influence or power; potent; efficacious; effective; strong; having authority or ascendency; as, an influential man, station, argument, etc. A very influential Gascon prefix. Earle.

Producing the appropriate or designed effect; efficacious; as, an operative dose, rule, or penalty.

Producing great physical effects; forcible; powerful' efficacious; as, a potent medicine. "Harsh and potent injuries." Shak. Moses once more his potent rod extends. Milton.

Being potent; endowed with energy adequate to a result; efficacious; influential. [Obs.] "And hath in his effect a voice potential." Shak.