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What is the opposite of ineffectual?

Need antonyms for ineffectual? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of unable or insufficient to produce any effect or result
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Adjective
Opposite of not producing any significant or desired effect
Adjective
Opposite of done in an inept or unskilful way
Adjective
Opposite of lacking strength or will in one's character
Adjective
(of a person) Opposite of shy, timid, and quiet
Adjective
Opposite of having the desire to do idealistic deeds without pragmatism
Adjective
Opposite of not valid or legally binding
“In essence, the plaintiff was claiming that he would not have acted as he did, had he not had a valid contract.”
Adjective
(of a faculty or part of the body) Opposite of reduced in quality or efficacy
“Owls are known for having powerful vision used for hunting prey.”
Adjective
Opposite of inferior or unimpressive in nature, especially in comparison
“In my personal opinion, Heath gave us a superior rendition of the Joker.”
Adjective
Opposite of lacking spirit or vitality
Adjective
Opposite of affected or over-refined
Adjective
Opposite of not convincing, plausible or believable
Adjective
Opposite of weak in intellectual power
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