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What is the opposite of ineffective?

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

Opposite of not producing any significant or desired effect
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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.”
Opposite of lacking strength or will in one's character
Opposite of inferior or unimpressive in nature, especially in comparison
“In my personal opinion, Heath gave us a superior rendition of the Joker.”
(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.”
Opposite of lacking in colour, spirit, or vitality
Opposite of confusing or disordered
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