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What is the opposite of efficacious?

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

(of something inanimate or abstract) Opposite of successful in producing a desired or intended result
Opposite of reasonable and convincing
Opposite of of a suitable quality, standard, or type to meet the required purpose
Opposite of denotes the effectiveness or dominance of a particular action
“Leaders who do not look after the interests of their followers are not only unethical but ineffective.”
Opposite of having great impact or influence
“We would end up an impotent and uninfluential nation, just one voice among the many.”
Opposite of incapable of going wrong or being misused
Opposite of convincing or compelling in nature
Opposite of based on, or displaying, common sense
“Of course, the moment I got there it was clear that all my concerns were completely groundless.”
Opposite of having, showing, or done with good judgment or sense
“His ideas are obviously foolish, easily disproved, an affront to any reasoning person.”
Opposite of being in effective or current operation, action, or force
“The rides have become inoperative since its closure in the early 2000s.”
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