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efficacious

British pronunciation/ˌɛfɪkˈe‍ɪʃəs/
American pronunciation/ˌɛfəˈkeɪʃəs/
efficacious
[ADJECTIVE]
1

(of a treatment or drug) demonstrating positive and successful results when tested

antonyms : inefficacious
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2

achieving the desired outcome or having a noticeable impact

synonyms : effective
effectual
antonyms : ineffective
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Examples
1. Is it efficacious?
2. And which was probably very kind of efficacious.
3. And you're not only efficacious in terms of skill in the world.
4. And you're not only efficacious in terms of skill in the world.
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