What is the opposite of effective?

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

Adjective
Opposite of having the power to produce a required effect
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“The snake oil sold to me was ineffective in relieving my pain.”
Adjective
Opposite of having a persuasive effect
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“The speaker's words were highly uncompelling in motivating the crowd to take action.”
Adjective
Opposite of in effect at the specified time
“The ban on flammable liquids will be rolled back next Monday.”
Adjective
Opposite of existing as fact without formal acknowledgment
“It was a hypothetical scenario and a figment of her imagination.”
Adjective
Opposite of describing someone who is highly useful or skilled at a particular task
“He was a highly incompetent programmer devoid of analytical skills.”
Adjective
Opposite of being in a healthy and functional state
“His faculties were still ailing after having endured multiple concussions during his sporting career.”
Adjective
(of a system) Opposite of capable of maximizing productivity at no expense of extra resources
“Procedures that were set up to expose and correct dishonesty were themselves blocked or shown to be inefficient.”
Adjective
Opposite of existing in reality or as a matter of fact
“The premise that this was built by aliens is highly conjectural!”
Adjective
Opposite of firm, strong, or substantial
“From years of decay, the columns holding the structure together appear to be fragile.”
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 convincing or effective
Adjective
Opposite of vigorous and energetic
Adjective
Opposite of so nearly the case that it can be regarded as so
“Please be aware of what you need to do in the unlikely event of an emergency.”
Adjective
Opposite of having or showing the ability to speak fluently and coherently
“Howard tried to speak but all that came out was an inarticulate, squeaky gargle.”
Adjective
Opposite of cleverly simple and clear
“It was a bit of a messy explanation, but it helped soften some of the unintentional bite that came with the character.”
Adjective
Opposite of based on, or displaying, common sense
Adjective
Opposite of vigorously keen or severe in expression or style
Adjective
Opposite of fluent or persuasive in speaking or writing
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 almost or nearly as described, but not completely or according to strict definition
Adjective
Opposite of capable of working successfully
Adjective
Opposite of incapable of going wrong or being misused
Adjective
Opposite of better or effective
Adjective
Opposite of grand and impressive in appearance
Adjective
Opposite of giving good value or return in relation to the money, time, or effort expended
Adjective
Opposite of concise and meaningful
Adjective
Opposite of concerned with what is actually the case (based on facts)
“The Curmudgeon is a satirical column based on fictitious characters in a mythical village.”
Adjective
Opposite of certain to happen
“Failure is avoidable if you take the necessary precautions.”
Adjective
(general) Opposite of having favorable consequences
“Not properly disposing of plastics can be detrimental to the environment.”
Adjective
Opposite of offering or producing the greatest advantage
“The worst thing you can do right now is to do nothing.”
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