inefficacious

• POS: Adjective
• HYPHEN: in=ef=fi=ca=cious

CIDE DICTIONARY

inefficacious, a. [Pref. in- not + efficacious: cf. F. inefficace, L. inefficax.].

 Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent.  Boyle.  [1913 Webster]
" Ineffectual, says Johnson, rather denotes an actual failure, and inefficacious an habitual impotence to any effect. But the distinction is not always observed, nor can it be; for we can not always know whether means are inefficacious till experiment has proved them ineffectual. Inefficacious is therefore sometimes synonymous with ineffectual."  [1913 Webster]
"The authority of Parliament must become inefficacious . . . to restrain the growth of disorders."  [1913 Webster]

OXFORD DICTIONARY

inefficacious, adj. (of a remedy etc.) not producing the desired effect.

Derivative

inefficaciously adv. inefficaciousness n. inefficacy n.

ROGET THESAURUS

inefficacious

Inutility

N inutility, uselessness, inefficacy, futility, ineptitude, inaptitude, unsubservience, inadequacy, inefficiency, unskillfulness, disservice, unfruitfulness (unproductiveness), labor in vain, labor lost, labor of Sisyphus, lost trouble, lost labor, work of Penelope, sleeveless errand, wild goose chase, mere farce, tautology, supererogation, vanitas vanitatum, vanity, inanity, worthlessness, nugacity, triviality, caput mortuum, waste paper, dead letter, blunt tool, litter, rubbish, junk, lumber, odds and ends, cast-off clothes, button top, shoddy, rags, orts, trash, refuse, sweepings, scourings, offscourings, waste, rubble, debris, detritus, stubble, leavings, broken meat, dregs, weeds, tares, rubbish heap, dust hole, rudera, deads, fruges consumere natus, useless, inutile, inefficacious, futile, unavailing, bootless, inoperative, inadequate, inservient, unsubservient, inept, inefficient, of no avail, ineffectual, incompetent, stale, flat and unprofitable, superfluous, dispensable, thrown away, abortive, worthless, valueless, priceless, unsalable, not worth a straw, dear at any price, vain, empty, inane, gainless, profitless, fruitless, unserviceable, unprofitable, ill-spent, unproductive, hors de combat, effete, past work, obsolete, fit for the dust hole, good for nothing, of no earthly use, not worth having, not worth powder and shot, leading to no end, uncalled for, unnecessary, unneeded, uselessly, to little purpose, to no purpose, to little or no purpose, Int, cui bono?, what's the good!, actum ne agas, chercher une aiguille dans une botte de foin, tanto buon che val niente.

Impotence

N impotence, inability, disability, disablement, impuissance, imbecility, incapacity, incapability, inaptitude, ineptitude, incompetence, unproductivity, indocility, invalidity, disqualification, inefficiency, wastefulness, telum imbelle, brutum fulmen, blank, blank cartridge, flash in the pan, vox et proeterea nihil, dead letter, bit of waste paper, dummy, paper tiger, Quaker gun, inefficacy, failure, helplessness, prostration, paralysis, palsy, apoplexy, syncope, sideration, deliquium, collapse, exhaustion, softening of the brain, inanition, emasculation, orchiotomy, orchotomy, cripple, old woman, muff, powder puff, creampuff, pussycat, wimp, mollycoddle, eunuch, powerless, impotent, unable, incapable, incompetent, inefficient, ineffective, inept, unfit, unfitted, unqualified, disqualified, unendowed, inapt, unapt, crippled, disabled, armless, harmless, unarmed, weaponless, defenseless, sine ictu, unfortified, indefensible, vincible, pregnable, untenable, paralytic, paralyzed, palsied, imbecile, nerveless, sinewless, marrowless, pithless, lustless, emasculate, disjointed, out of joint, out of gear, unnerved, unhinged, water-logged, on one's beam ends, rudderless, laid on one's back, done up, dead beat, exhausted, shattered, demoralized, graveled, helpless, unfriended, fatherless, without a leg to stand on, hors de combat, laid on the shelf, null and void, nugatory, inoperative, good for nothing, ineffectual, inadequate, inefficacious, der kranke Mann, desirous still but impotent to rise, the spirit is willing but the flesh is weak.