useless

useless adjective aimless, barren, counterproductive, effete, empty, failed fatuitous, fatuous, feckless, for naught, frivolous, fruitless, functionless, futile, idle, impotent, inadequate, inane, incapable, incompetent, ineffective, ineffectual, inefficacious, inept, inessential, inoperative, inutile, invalid, meaningless, needless, no go, no good, not serving any purpose, nugatory, null and void, of no avail, of no force, of no purpose, of no use, otiose, pointless, powerless, purposeless, redundant, superfluous, to no avail, to no purpose, trivial, unavailing, unfit, unhelpful, unimportant, unnecessary, unproductive, unprofitable, unsatisfactory, unserviceable, unsuccessful, unusable, vain, valueless, void, worthless

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See also: disabled, expendable, futile, impracticable, inadequate, incapable, incompetent, inept, insignificant, invalid, needless, nugatory, null, null and void, otiose, paltry, powerless, redundant, superfluous, trivial, unable, unavailing, unfit, unproductive, unsatisfactory, void