What is the opposite of effectual?

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

Opposite of producing or capable of producing a desired result
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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 denotes a constructive or productive feeling
“As a result of their unproductive response, we were unable to attain the information required to proceed.”
Opposite of having a marked effect or impact
Opposite of being in effective operation
“The rides have become inoperative since its closure in the early 2000s.”
Opposite of using materials at hand efficiently
“This is a wasteful process that will cause a net loss of nitrogen to livestock and pollution of the environment.”
Opposite of vigorous and energetic
Opposite of vigorous or incisive in expression or style
Opposite of fast or responsive in one's thinking
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