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Definition of efficacious:

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


good, telling, sound, trenchant, thrive, efficient, in effect, impelling, rough-and-ready, productive, hard-hitting, effective, impressive, in force, legal, effectual.

  • effective (part of speech: adjective)

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