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.

Adjective
Opposite of successful in producing a desired or intended result
Adjective
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.”
Adjective
Opposite of denotes a constructive or productive feeling
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“As a result of their unproductive response, we were unable to attain the information required to proceed.”
Adjective
Opposite of having a marked effect or impact
Adjective
Opposite of being in effective or current operation, action, or force
“The rides have become inoperative since its closure in the early 2000s.”
Adjective
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.”
Adjective
Opposite of vigorous and energetic
Adjective
Opposite of fast or responsive in one's thinking
“Brian would hang up the phone because he felt he was too stupid to figure out the girth of a box.”
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