See ineffectual in Webster's New World Roget's A-Z Thesaurus II
adjective
Not having the desired effect:
ineffective, inefficacious, inefficient, useless. See affectHaving no useful purpose:
inutile, unusable, useless, worthless. See usedNot capable of accomplishing anything:
helpless, impotent, inadequate, incapable, powerless, weak. See ability, strong
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