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effectual
 
Adjective effectual has 3 senses
  1. effectual - sufficient to produce a result; "a man to whom painting was but another and less effectual way of writing dramas or novels or history"
    Antonym:     ineffectual
  2. effective, effectual, efficacious - producing or capable of producing an intended result or having a striking effect; "an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation"-LewisMumford; "effective teaching methods"; "effective steps toward peace"; "made an effective entrance"; "his complaint proved to be effectual in bringing action"; "an efficacious law"
  3. effectual - exerting or capable of exerting strong physiological or chemical effects; "an effectual vaccine"
    Antonym:     impotent (indirect, via potent)
effectively effectiveness effectivity effector effectove effects effects of infectious agent effects of water pollution effectual effectuality effectually effectualness effectuate effectuated effectuation effectuer effed

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