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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.

Adjective
Opposite of not producing any significant or desired effect
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Adjective
Opposite of lacking in spirit, vitality or character
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
Opposite of lacking strength or will in one's character
Adjective
Opposite of lacking vigor or effectiveness
Adjective
Opposite of lacking spirit or vitality
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 having a pale or unhealthy skin tone
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.”
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