Efficacy is a related term of effectual.
As an adjective effectual
is producing the intended result; entirely adequate.
As a noun efficacy is
ability to produce a desired amount of a desired effect.
effectual
English
Alternative forms
* effectuall (obsolete)
Adjective
(
en adjective)
Producing the intended result; entirely adequate.
{{quote-Fanny Hill, part=3
, Redoubling, then, the active energy of his thrusts, favoured by the fervid appetite of my motions, the soft oiled wards can no longer stand so
effectual a picklock, but yield, and open him an entrance.}}
Antonyms
* ineffectual
Related terms
* effect
* effective
* effectivity
* efficacious
* efficacity
* efficacy
* efficiency
* efficient
efficacy
English
Noun
(-)
(uncountable) Ability to produce a desired amount of a desired effect.
Synonyms
* efficacity
Related terms
* effect
* effective
* effectiveness
* effectivity
* effector
* effectual
* effectuate
* efficacious
* efficacity
* efficiency
* efficient
External links
*
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