Толковый словарь английского языка Oxford English Reference - ineffectual

adj. 1 a without effect. b not producing the desired or expected effect. 2 (of a person) lacking the ability to achieve results (an ineffectual leader). Derivatives ineffectuality n. ineffectually adv. ineffectualness n. Etymology: ME f. med.L ineffectualis (as IN-(1), EFFECTUAL)