List of ineffectual synonyms and ineffectual related words.
abortive, acarpous, aimless, arid, barren, bootless, borne, celibate, childless, counterproductive, desert, desolate, drained, dried-up, dry, effete, emasculate, empty, etiolated, exhausted, failed, failing, fallow, fatuitous, fatuous, featherweight, feckless, forceless, fruitless, futile, gaunt, gelded, ill-qualified, impotent, inadequate, inane, incapable, incompetent, ineffective, inefficacious, inefficient, infecund, infertile, inoperative, invalid, invertebrate, issueless, jejune, lame, leached, lightweight, limited, maladjusted, manque, mean, meaningless, menopausal, miscarried, miscarrying, narrow, no go, no-account, nonfertile, nonproducing, nonproductive, nonprolific, not equal to, not up to, nugacious, nugatory, of no account, of no effect, of no force, of no use, paltry, pointless, powerless, purposeless, set, sine prole, small, spineless, sterile, stickit, stillborn, successless, sucked dry, superfluous, teemless, unable, unadapted, unadjusted, unauthoritative, unavailable, unavailing, uncultivated, unequipped, unfertile, unfit, unfitted, unfortunate, unfruitful, unplowed, unproductive, unprolific, unqualified, unsown, unsuccessful, untilled, useless, vain, virgin, waste, wasted, weak, without any weight, without issue