(a.) Useless; unprofitable.

abortive aimless barren bootless counterproductive deleterious detrimental disadvantageous disserviceable effete empty etiolated failed failing fatuitous fatuous feckless fruitless fustian futile good-for-nothing harmful hopeless idle impotent impracticable impractical inadequate inane incompetent ineffective ineffectual inefficacious inefficient inept injurious inoperative inutile invalid lame manque meaningless miscarried miscarrying no go nonfunctional nugacious nugatory of no effect of no force of no use pointless prejudicial purposeless sterile stickit stillborn successless superfluous unadvantageous unavailable unavailing unfavorable unfortunate unpractical unproductive unprofitable unpurposed unrewarding unserviceable unsuccessful unusable unworkable vain worthless