(ת') לא מועיל; לא יעיל, שאינו מביא לתוצאות; נטול כוח

adj. inefficient, not producing results; futile; powerless, helpless

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Adjective
1. not sufficient to produce a desired result; "an ineffectual effort to block the legislation"
(antonym) effectual
(see-also) ineffective, uneffective
2. not producing an intended effect; "an ineffective teacher"; "ineffective legislation"
(synonym) ineffective, uneffective
(similar) toothless
(see-also) idle
(attribute) effectiveness, effectivity, effectualness, effectuality
3. producing no result or effect; "a futile effort"; "the therapy was ineffectual"; "an otiose undertaking"; "an unavailing attempt"
(synonym) futile, otiose, unavailing
(similar) useless
4. lacking in power or forcefulness; "an ineffectual ruler"; "like an unable phoenix in hot ashes"
(synonym) ineffective, unable
(similar) impotent

Przym. nieskuteczny

(a.)
Not producing the proper effect; without effect; inefficient; weak; useless; futile; unavailing; as, an ineffectual attempt; an ineffectual expedient.
  

Synonyms and 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