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
Adjective
Opposite of not producing the desired result
Adjective
Opposite of lacking strength of character
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 lacking in colour, spirit, or vitality
Adjective
Opposite of possessing or acting with the desire to do noble and romantic deeds, without thought of realism and practicality
Adjective
Opposite of confusing or disordered
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