• WordNet 3.6
    • adj impracticable not capable of being carried out or put into practice "refloating the sunken ship proved impracticable because of its fragility","a suggested reform that was unfeasible in the prevailing circumstances"
    • ***
Webster's Revised Unabridged Dictionary
    • Impracticable Incapable of being used or availed of; as, an impracticable road; an impracticable method.
    • Impracticable Not practicable; incapable of being performed, or accomplished by the means employed, or at command; impossible; as, an impracticable undertaking.
    • Impracticable Not to be overcome, persuaded, or controlled by any reasonable method; unmanageable; intractable; not capable of being easily dealt with; -- used in a general sense, as applied to a person or thing that is difficult to control or get along with. "This though, impracticable heart
      Is governed by a dainty-fingered girl."
      "Patriotic but loyal men went away disgusted afresh with the impracticable arrogance of a sovereign."
    • ***
Century Dictionary and Cyclopedia
    • impracticable Incapable of accomplishment; not to be practised, performed, carried out, or effected by the means at command.
    • impracticable Incapable of being used; unfit for the purpose intended or desired; unserviceable; unavailable; of persons, unmanageable; untractable.
    • impracticable Synonyms Impossible, Impracticable. See impossible. 1 and 2. Impracticable, Unpractical. The meanings of the two words approach each other at two points, but still are clearly distinct: Of a thing: impracticable, not possible to be done without expense or sacrifice greater than is advisable; unpractical, not dictated by or in harmony with the lessons of experience in actual work: as, an unpractical plan.
    • impracticable Of a person: impracticable, not easily managed; unpractical, not showing that sort of wisdom which is the result of experience in affairs.
    • n impracticable One who is unmanageable, unreasonable, or stubborn.
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Chambers's Twentieth Century Dictionary
    • adj Impracticable im-prak′tik-a-bl not able to be done: unmanageable: stubborn
    • ***


  • Francois De La Rochefoucauld
    “Few things are impracticable in themselves; and it is for want of application, rather than of means, that men fail to succeed.”


In literature:

In one case it worked very well, but as a rule appeared to be almost impracticable.
"Scientific American Supplement, No. 497, July 11, 1885" by Various
Flight was humiliating and dreadful, but to remain in England was impracticable.
"Beaux and Belles of England" by Mary Robinson
The Stuarts have been condemned and laughed at, for the folly and impracticability of their attempts in 1715, and 1745.
"The Letters of Robert Burns" by Robert Burns
Even if anyone had wished to do so, it would have been simply impracticable to conceal or to falsify anything.
"Freeland" by Theodor Hertzka
It is most irritating to have anything to do with such impracticable and silly mortals.
"The Atlantic Monthly, Vol. 10, No. 58, August, 1862" by Various
He dismissed it as impracticable.
"The Spenders" by Harry Leon Wilson
Solitude is impracticable, and society fatal.
"The Atlantic Monthly, Volume 1, Issue 2, December, 1857" by Various
He pleaded the probable utter impracticability of such an enterprise.
"The Wolf's Long Howl" by Stanley Waterloo
In my case such a step was impracticable.
"The Life of Lord Byron" by John Galt
He rose to walk about, found it impracticable and sat down.
"Miss Lulu Bett" by Zona Gale
He said, 'We'll not be driven tamely from it:'-but it proved impracticable.
"Life Of Johnson, Volume 5" by Boswell
If you find him impracticable, stop.
"Beacon Lights of History, Volume I" by John Lord
After a few more arguments as to the impracticability of his suggestions, the men dispersed, casting meaning glances at each other.
"For Gold or Soul?" by Lurana W. Sheldon
A distribution to the people is impracticable and unjust in other respects.
"A Compilation of the Messages and Papers of the Presidents" by James D. Richardson
Any other system would have been impracticable.
"The Anti-Slavery Examiner, Part 3 of 4" by American Anti-Slavery Society
Any other system would have been impracticable.
"The Anti-Slavery Examiner, Omnibus" by American Anti-Slavery Society
As an imaginative work it would have been considered worthless and impracticable.
"What is Coming?" by H. G. Wells
When this is impracticable, nutrient enemata are called for.
"Manual of Surgery" by Alexis Thomson and Alexander Miles
Massive benches or ledges, abrupt and high, seemed to render farther ascent impracticable.
"The Delight Makers" by Adolf Bandelier
The narrow and tortuous channel which connected Lake Alexandrina with Encounter Bay was impracticable even for a boat.
"The Australian Explorers" by George Grimm

In poetry:

He made a feast, drank fierce and fast,
And crowned his hair with flowers -
No easier nor no quicker passed
The impracticable hours.
"The Pagan World" by Matthew Arnold

In news:

More importantly, many unpalatable or impracticable things can help people lose weight, including eating woodchips or wrestling bears.

In science:

This cubic term leads to the impracticable trace condition T rΣ2 = 0 for the missing VEV vacuum configuration, unless there is a special fine-tuned cancellation between T rΣ2 and driving terms stemming from other parts of the superpotential W .
From Prototype SU(5) to Realistic SU(7) SUSY GUT
This type of configuration is suitable for counter designs requiriring a large geometrical acceptance {detection area}⊗{angular range}, for which the use of focussing devices is severely limited or even impracticable, provided the required velocity resolution is not too high.
Experimental study of a proximity focusing Cherenkov counter prototype for the AMS experiment
It is equivalent to giving a formal expression of qs (V , T ) that is impracticable to handle for large size clusters.
Clusters in Simple Fluids
It becomes noticeable that SWRs’ values are excessively high at the frequencies of 900 and 1111 [MHz]. Consequently, the utilization of the antenna at the pre-mentioned frequencies is impracticable.
"D-Dimond1", Prototype Antenna RGA-05
These numerical techniques are efficient and yield accurate estimates of high percentiles of sums of random variables provided that these are not too heavy-tailed: their computational cost increases as the tails of the probability distribution become heavier, and eventually become impracticable.
Percentiles of sums of heavy-tailed random variables: Beyond the single-loss approximation
Snapshots are poorly suited to this task, as they are severely limited by the dynamic range of the data, which generally makes interpolation impossible unless the interval between snapshots is made impracticably small.
MODEST-1: Integrating Stellar Evolution and Stellar Dynamics
This makes the aforementioned exact relation unwieldy and impracticable to say the least.
Computers and Liquid State Statistical Mechanics
The same effect could be achieved with an independent laser beam used from the right on the 2MC, but it would require impracticably high powers.
Trapping and Cooling a mirror to its quantum mechanical ground state
A direct measurement of the relevant mechanical losses at the frequencies of the detection band of IGWDs is often impracticable as the losses are typically extremely low in this region. A more feasible approach is to determine the mechanical losses at the resonances of the test masses.
On the mechanical quality factors of cryogenic test masses from fused silica and crystalline quartz
For problems with a high dimensional θ this inefficiency is likely to make the application of a rejection type algorithm impracticable.
Approximate Bayesian computation (ABC) gives exact results under the assumption of model error
Often it is easy to simulate from the models but calculating the likelihood of the data, even using computationally-intensive methods, is impracticable.
Constructing Summary Statistics for Approximate Bayesian Computation: Semi-automatic ABC
The use of ABC initially became popular within population genetics, where simulation from a range of population genetic models is possible using the coalescent (Kingman, 1982), but where calculating likelihoods is impracticable for realistic sized data sets.
Constructing Summary Statistics for Approximate Bayesian Computation: Semi-automatic ABC
However fitting the linear model with the resulting 4 × 104 exaplanatory variables is impracticable.
Constructing Summary Statistics for Approximate Bayesian Computation: Semi-automatic ABC
Above that energy, we would have to access information on γ γ → nπ and ππ → nπ (with n ≥ 4) too and the analysis becomes impracticable, at present.
Determination of Radiative Widths of Scalar Mesons from Experimental Results on $\gamma\gamma\to\pi\pi$
As with all approaches, our method is impracticable if there are extremely long transients or once the dimension of the attractor becomes too large.) With experimental data, there is the additional effect of noise to be taken into consideration.
A New Test for Chaos