Antonyms for ineffective

abortive:

consummated, productive, complete, successful, fruitful.

all:

effective.

feckless:

purposeful, responsible.

fruitless:

plentiful, copious, profitable, potent.

futile:

hopeful.

impotent:

capable, able, fertile.

incapable:

qualified.

ineffective:

effective.

ineffective/ineffectual:

effectual, powerful, efficient, strong, useful, competent.

inefficient:

expert.

lame:

satisfactory.

noun:

expedient, virtuous, worthwhile, practicable, meaningful, feasible, successful, usable, workable, beneficial, sufficient, applicable, realizable, stiff, practical, operant, profitable, adequate, deadly, useful.

n.:

toothed, virile.

Paraphrases for Ineffective:

• Adjective :
  active, actual, aggressive, authentic, bad, beneficial, cost-effective, cost-effectiveness, counterproductive, cross, cumbersome, defective, deficient, disabled, dormant, dysfunctional, effect, effective, effectiveness, efficacious, efficacy, efficiency, efficient, elusive, empty, energetic, enforceable, evil, expiry, failed, feeble, flawed, fruitless, futile, helpful, helpless, hollow, hopeless, idle, ill, impermissible, impossible, impotent, improper, inactive, inadequate, inappropriate, incapable, incompetent, incomplete, inconclusive, inconsequential, incorrect, ineffectual, inefficient, inept, inexpedient, inoperable, inoperative, instrumental, insufficient, invalid, irrelevant, little, lousy, meaningful, meaningless, moot, nasty, needless, neutral, nil, no-effect, no., non-, Non-existent, non-valid, not, null, obsolete, operative, outcome, outturn, pointless, poor, potent, powerful, powerless, pro-active, proactive, redundant, responsive, senseless, sterile, successful, superfluous, terrible, toothless, unable, undue, unfit, unfulfilled, unhealthy, unheeded, unhelpful, unnecessary, unproductive, unrealized, unsatisfactory, unsuccessful, unsuitable, unusable, unwanted, unwarranted, unwieldy, unworkable, useful, useless, vain, valid, valuable, viable, vigorous, void, wasteful, weak, well-functioning, workable, worthless, worthwhile, wrong, zero.
• Noun, singular or mass :
  failure, ineffectiveness, inefficiency, inefficient, invalidity, nullification, nullity, void.
• Proper noun, singular :
  inefficient.