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 not performing a task or function to the best advantage
Adjective
Opposite of feeble or insipid in quality or character
Adjective
(of a person) Opposite of shy, timid, and quiet
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 relating to or resembling farce, especially because of absurd or ridiculous aspects
Adjective
Opposite of arousing scornful pity or contempt, often due to miserable inadequacy
“Cleaves earned a niche in the scholarly world as a man who made a respectable attempt to rescue several noteworthy historical characters from relative obscurity.”
Adjective
Opposite of lacking in colour, spirit, or vitality
Adjective
Opposite of affected, over-refined, and ineffectual
Adjective
Opposite of possessing or acting with the desire to do noble and romantic deeds, without thought of realism and practicality
Adjective
Opposite of not convincing, plausible or believable
Adjective
Opposite of weak in intellectual power
Adjective
Opposite of domesticated, compliant
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