Ineffective
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responsible, consummated, qualified, powerful, practicable, worthwhile, plentiful, competent, realizable, effectual, virtuous, able, hopeful, toothed, satisfactory, profitable, fruitful, expert, feasible, operant, efficient, productive, expedient, workable, sufficient, virile, potent, meaningful, practical, stiff, beneficial, effective, successful, adequate, copious, deadly, fertile, applicable, usable, complete, capable, useful, strong, purposeful.