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Adjective ineffective has 3 senses
ineffective, uneffective, ineffectual - not producing an intended effect; "an ineffective teacher"; "ineffective legislation"Antonyms:  effective, effectual, efficacious, hard-hitting, trenchant, impelling, impressive, telling, rough-and-ready
 
ineffective, ineffectual, unable - lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes"Antonyms:  potent, strong (indirect, via impotent)
 
ineffective, inefficient - lacking the ability or skill to perform effectively; inadequate; "an ineffective administration"; "inefficient workers"Antonym:  competent (indirect, via incompetent)
 
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