Ineffectual

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Ineffectual

Not producing the proper effect; without effect; inefficient; weak; useless; futile; unavailing; as, an ineffectual attempt; an ineffectual expedient. The peony root has been much commended, . . . And yet has been by many found ineffectual. (Boyle)

Synonym: Inefficient, useless, inefficacious, vain, fruitless, unavailing, futile. See Uselesss, Inefficacious.