effective, effectual, efficacious

ineffectual, useless, inadequate, inept, impotent, inefficient, counterproductive, inconsistent, unreliable, unproductive, unworkable, effective, futile, incompetent, irrelevant, inefficacious, flawed, pointless, insufficient, deficient, misguided, toothless, incapable, problematic, untrustworthy, powerless, unsatisfactory, wasteful, undependable, meaningless, unhelpful, outdated, nonexistent, unproven, nonfunctional, costly, unfocused, imprecise, uncoordinated, unnecessary, superfluous, disorganized, uncreative, inaccurate, erratic, unpractical, cumbersome, fruitless, hopeless, inapt, impractical, clumsy, obsolete, infeasible, disinterested, worthless, disjointed, wrongheaded, unwise, illogical, unconvincing, inflexible, irresponsive, indecisive, unimpressive, halfhearted, abysmal, unpersuasive, unworthy, amateurish, unimaginative, unusable, untested, inexperienced, outmoded, unsuccessful, uncompetitive, laughable, reliant, untenable, unproved, unmotivated, helpless, hamstrung, unenforceable, obstructive, slipshod, unsystematic, incoherent, unsupportable, inoperative, feeble, inequitable, unbalanced, haphazard, indifferent, anemic, unpopular, shoddy, weak, dysfunctional, antiquated, proactive, preventative, costeffective, efficacious, efficient, focused, innovative, routinized, coordinated, noncoercive, participative, preventive, ordinated, coercive, psychotherapeutic, remedial

amiodarone, break, break down, cancel, cordarone, crush, deactivation, defusing, hamstring, ineffectively, inefficaciously, invalidate, mephenytoin, mesantoin, negate, neutralise, neutralization fire, neutralize, nullify, piffle, strike down, underdevelop, verbose, vitiate, void

unable, uneffective