(a.) Not effective; ineffectual; futile; inefficient; useless; as, an ineffective appeal.

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