Not producing the proper effect; without effect; inefficient; weak; useless; futile; unavailing; as, an ineffectual attempt; an ineffectual expedient.

producing no result or effect; "a futile effort"; "the therapy was ineffectual"; "an otiose undertaking"; "an unavailing attempt"

lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes"

not sufficient to produce a desired result; "an ineffectual effort to block the legislation"

not producing an intended effect; "an ineffective teacher"; "ineffective legislation"