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ineffaceably
Ineffectible
Ineffective
ineffectively
ineffectiveness
Ineffectual
ineffectuality
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Ineffectualness
Ineffervescence
Ineffervescent
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Ineffervescible
Inefficaciously
Inefficaciousness
Inefficacy
Inefficiency
Inefficient
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inegalitarian
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Inelastic
inelastic collision
inelastic scattering
Inelasticity

Inefficacious definitions

Webster's 1828 Dictionary

INEFFICA'CIOUS, a. [L. inefficax; in and efficax, efficio, to effect; ex and facio, to make.]
Not efficacious; not having power to produce the effect desired, or the proper effect; of inadequate power or force.
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 cannot always know whether means are inefficacious, till experiment has proved them ineffectual; nor even then, for we cannot be certain that the failure of means to produce an effect is to be attributed to habitual want of power, or to accidental and temporary causes.
Inefficacious is therefore sometimes synonymous with ineffectual.

WordNet (r) 3.0 (2005)

adj
1: lacking the power to produce a desired effect; "laws that are inefficacious in stopping crime" [ant: efficacious]

Merriam Webster's

adjective Date: 1658 lacking the power to produce a desired effect ; ineffective inefficaciously adverb inefficaciousness noun

Oxford Reference Dictionary

adj. (of a remedy etc.) not producing the desired effect. Derivatives: inefficaciously adv. inefficaciousness n. inefficacy n.

Webster's 1913 Dictionary

Inefficacious In*ef`fi*ca"cious, 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. The authority of Parliament must become inefficacious . . . to restrain the growth of disorders. --Burke. Note: Ineffectual, says Johnson, rather denotes an actual failure, and inefficacious and 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.

Soule's Dictionary of English Synonyms

a. Ineffective, unavailing. See ineffectual.



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