List of ineffective synonyms and ineffective related words.
abortive, aimless, barren, bootless, counterproductive, effete, emasculate, empty, etiolated, failed, failing, fatuitous, fatuous, featherweight, feckless, forceless, fruitless, futile, ill-qualified, impotent, inadequate, inane, incapable, incapable of, incompetent, ineffectual, inefficacious, inefficient, inept, inferior, inoperative, invalid, invertebrate, lame, lightweight, maladjusted, manque, meaningless, miscarried, miscarrying, no go, no-account, not equal to, not up to, nugacious, nugatory, of no account, of no effect, of no force, of no use, pointless, powerless, purposeless, spineless, sterile, stickit, stillborn, successless, superfluous, unable, unable to, unadapted, unadjusted, unauthoritative, unavailable, unavailing, unendowed, unequipped, unfit, unfitted, unfortunate, ungifted, unproductive, unqualified, unsuccessful, untalented, useless, vain, weak, without any weight, worthless