• WordNet 3.6
    • adj insoluble without hope of solution "an insoluble problem"
    • adj insoluble (of a substance) incapable of being dissolved
    • adj insoluble admitting of no solution or explanation "an insoluble doubt"
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Plant life could not exist without lightning. Nitrogen, an essential food for plants, comprises 80% of the atmosphere, but in a form that is insoluble and unusable. It's the intense heat of lightning that forces the nitrogen to combine with oxygen in the air, forming nitrogen oxides that are soluble in water and fall to the earth in rain as dilute nitric acid. This reacts with minerals in the ground to become the nitrates on which the plants depend.
    • Insoluble Not soluble; in capable or difficult of being dissolved, as by a liquid; as, chalk is insoluble in water.
    • Insoluble Not to be solved or explained; insolvable; as, an insoluble doubt, question, or difficulty.
    • Insoluble Strong. "An insoluble wall."
    • ***
Century Dictionary and Cyclopedia
    • insoluble That cannot be loosed or undone.
    • insoluble Not soluble; incapable of being dissolved.
    • insoluble Incapable of being solved or explained; not susceptible of solution or explanation.
    • n insoluble A thing which is insoluble; a problem that cannot be solved.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Insoluble in-sol′ū-bl not capable of being dissolved: not to be solved or explained
    • ***


  • Alexander Douglas Home
    Alexander Douglas Home
    “There are only two problems in my life. The political ones are insoluble and the economic ones are incomprehensible.”
  • Lee Iacocca
    “We are continually faced by great opportunities brilliantly disguised as insoluble problems.”
  • Henry Brooks Adams
    “Unintelligible answers to insoluble problems.”
  • Benjamin Disraeli
    “The pursuit of science leads only to the insoluble.”


Webster's Revised Unabridged Dictionary
L. insolubilis, indissoluble, that can not be loosed: cf. F. insoluble,. See In- not, and Soluble, and cf. Insolvable


In literature:

Insoluble problems are only created if you try to confine them inside, keep them still or hamper their play.
"My Reminiscences" by Rabindranath Tagore
Making Glue Insoluble in Water.
"Practical Mechanics for Boys" by J. S. Zerbe
From the beginning of literature this has been a well-nigh insoluble problem.
"A Book for All Readers" by Ainsworth Rand Spofford
The soluble bicarbonates of lime and magnesia, losing their carbonic acid, thereby become insoluble and precipitate.
"Steam, Its Generation and Use" by Babcock & Wilcox Co.
The most aggravating and insoluble perplexity which tormented the Southern people lay in dealing with the colored race.
"History of the United States, Volume 5" by E. Benjamin Andrews
But no writer remains more solidly and insolubly entire.
"Classic French Course in English" by William Cleaver Wilkinson
Whether he approved, disapproved, or furiously disliked, he remained insoluble as the Sphinx.
"The Lady of the Basement Flat" by Mrs. George de Horne Vaizey
Always this insoluble question!
"Godfrey Morgan" by Jules Verne
The seventh gives the sum of the available and insoluble, and should be ignored.
"Crops and Methods for Soil Improvement" by Alva Agee
Thus, to give our illustration, the insoluble problem of squaring the circle presents us with a good nominal idea.
"The Posthumous Works of Thomas De Quincey, Vol. 1 (2 vols)" by Thomas De Quincey
Thus we are brought face to face with a difficulty as insoluble as is that of free will and predestination.
"The Best of the World's Classics, Restricted to Prose, Vol. VI (of X)--Great Britain and Ireland IV" by Various
It reaches the market in a fine powder, which is insoluble in water.
"Vegetable Dyes" by Ethel M. Mairet
The Frankfort assembly had left the Austrian riddle unsolved, and apparently insoluble.
"Great Men and Famous Women. Vol. 4 of 8" by Various
This consequence, which to me seems immediate, renders the problem insoluble.
"New observations on the natural history of bees" by Francis Huber
It is very curious, indeed, that carbonic acid gas should render lime soluble in one instance, and insoluble in the other!
"Conversations on Chemistry, V. 1-2" by Jane Marcet
The Wages Question seems likely to prove insoluble.
"British Socialism" by J. Ellis Barker
One of the insoluble mysteries of German life is the cheapness of furnished lodgings as compared with the high rent and rates.
"Home Life in Germany" by Mrs. Alfred Sidgwick
From either point of view the question was unanswerable, and the problem insoluble.
"The Cryptogram" by James De Mille
How was he to fathom that mysterious soul and read its insoluble riddle?
"The Frontier" by Maurice LeBlanc
Thus we are brought face to face with a difficulty as insoluble as is that of free will and predestination.
"The Variation of Animals and Plants Under Domestication, Volume II (of 2)" by Charles Darwin

In poetry:

I do not know if I am suffering
or if is someone having fun
(and why not?) in the scarce night
with an insoluble piccolo.
"Lost Hope" by Carlos Drummond de Andrade

In news:

Insoluble fiber remains more intact as it passes through the digestive system.
Insoluble fiber doesn't really break down in the intestines.
If the perennial culture war between science and fundamentalist Christianity about evolution seems insoluble, the reason is that it is insoluble.
Tackling the Problems of Insolubility .
Is Cubberley's future an insoluble dilemma or a community test.
There are two kinds of fiber, soluble and insoluble , and neither contains calories.
Test Method Ca 5a-40 Ca 3a-46 Ca 2c-25 or Ca 2b-38 Cc 8d-55 Cc 12-59 Ca 6a-40 Determination Free Fatty Acids Insoluble Impurities Moisture.
IN the annals of Washington policy debates, few have been as emotional, and seemingly insoluble, as those involving immigration.
As the polymer is insoluble in the water already in the tubes, the polymer gathers at the ends and forms caps .
Soluble and insoluble fiber are fabulous part of a healthy diet.
"For all practical purposes, neither soluble nor insoluble fiber is affected by puréeing in your kitchen," said Christina Stark, a nutritionist with the division of nutritional sciences at Cornell University.
The problems the United States confronts are large but not insoluble.

In science:

Many NP-complete constraint satisfaction problems appear to undergo a “phase transition” from solubility to insolubility when the constraint density passes through a critical threshold.
Random k-SAT: Two Moments Suffice to Cross a Sharp Threshold
This nonlinear and nonlocal equation appears insoluble; however, important physical features can now be established analytically.
Extremal Properties of Random Structures
PEGylated nanographene oxide for delivery of water-insoluble cancer drugs. J.
Carbon Nanotubes in Biology and Medicine: in vitro and in vivo Detection, Imaging and Drug Delivery
Matrix tablets are formulated as powder mixtures of the pharmaceutically active drug and at least two inactive ingredients, namely water soluble excipients and water insoluble polymers.
Topological and Geometrical Random Walks on Bidisperse Random Sphere Packings
After using the algorithm described above we exclude all but one of the covers Dα due to local insolubility and we manage to compute all the rational points of this remaining cover D1 by other means (found in ,).
Descent on superelliptic curves
Admissible estimators, recurrent diffusions, and insoluble boundary value problems.
Discussion of "Estimating Random Effects via Adjustment for Density Maximization" by C. Morris and R. Tang
DTd clearly presents chemical equilibrium as a system phenomenon. DTd intent is to extend horizons of our understanding and to solve previously insoluble problems in real systems.
New Thermodynamic Paradigm of Chemical Equilibria
Markov, Insolubility of the problem of homeomorphy, Proc.
Computational topology with Regina: Algorithms, heuristics and implementations
The lenses and glass plates which support the mask and Lyot stop are made from insoluble Fluoride glass (AFG  made by Le Verre Fluor(cid:19)e) which transmits infrared wavelengths. ...
High angular resolution coronography for adaptive optics
However other proteins (e.g. structural proteins) are almost insoluble under physiological conditions and prefer to form aggregates .
Heteropolymers in a Solvent at an Interface
Many of the proteins which are insoluble in water are segregated into membranes which have a lipid bilayer structure .
Heteropolymers in a Solvent at an Interface
In many cases, the quartic is insoluble so searching is futile.
A simple practical higher descent for large height rational points on certain elliptic curves
Thus there are only two essentially different quartics, and it is easy to show the relationship between them implies that they are both soluble or both insoluble.
A simple practical higher descent for large height rational points on certain elliptic curves
It was also assumed that this view is justified, in particular, for systems where the adatom is insoluble in the bulk substrate.
Theory of Adsorption on Metal Substrates
In that case the conflict with the LSND data will be insoluble, which will call for new results from MiniBooNE , the next new independent accelerator experiment.
Blocking Active-Sterile Neutrino Oscillations in the Early Universe with a Majoron Field