• WordNet 3.6
    • adj insuperable impossible to surmount
    • adj insuperable incapable of being surmounted or excelled "insuperable odds","insuperable heroes"
    • ***
Webster's Revised Unabridged Dictionary
    • a Insuperable Incapable of being passed over or surmounted; insurmountable; as, insuperable difficulties. "And middle natures, how they long to join,
      Yet never pass the insuperable line?"
      "The difficulty is enhanced, or is . . . insuperable ."
    • ***
Century Dictionary and Cyclopedia
    • insuperable Not superable; incapable of being passed over, overcome, or surmounted.
    • insuperable Synonyms Insurmountable, impassable, unconquerable, invincible.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Insuperable in-sū′pėr-a-bl that cannot be passed over: unconquerable
    • ***


Webster's Revised Unabridged Dictionary
L. insuperabilis,: cf. OF. insuperable,. See In- not, and Superable
Chambers's Twentieth Century Dictionary
O. Fr.,—L.,—in, not, superabilissuperāre, to pass over—super, above.


In literature:

Without it the problem would be insuperable.
"The Nation's River" by United States Department of the Interior
We have seen, then, that the geographical distribution of animals presents difficulties, though not insuperable ones, for the Darwinian hypothesis.
"On the Genesis of Species" by St. George Mivart
Consider once more while you have time that the difficulties are almost insuperable.
"The Arabian Nights" by Unknown
The great and insuperable one was its want of power.
"The International Monthly Magazine, Volume 5, No. 1, January, 1852" by Various
Others excused themselves from encountering such gigantic obstacles by calling them insuperable.
"Pushing to the Front" by Orison Swett Marden
I have always felt this an insuperable difficulty.
"'That Very Mab'" by May Kendall and Andrew Lang
Still we worked our onward way, my father being confident that we should encounter no insuperable obstacles.
"With Axe and Rifle" by W.H.G. Kingston
I did not tell her there was the most insuperable of all barriers in the way of my marrying any one, and that I had no desire if I could.
"Some Everyday Folk and Dawn" by Miles Franklin
The obstacles now before them appeared almost insuperable.
"The Secret Wireless" by Lewis E. Theiss
The great error in Rip's composition was an insuperable aversion to all kinds of profitable labor.
"The Short-story" by William Patterson Atkinson

In poetry:

Cold from colossal ramparts gleam,
At their insuperable posts,
The seven princes of the hosts
Who guard the holy North supreme;
"The Testimony of the Suns" by George Sterling
O Death! O Change! O Time!
Without you, O, the insuperable eyes
Of these poor Might-Have-Beens,
These fatuous, ineffectual Yesterdays!
"Under A Stagnant Sky" by William Ernest Henley

In news:

For decades, the barriers that have separated the people of New York and Hart Island have been nearly as insuperable as the boundaries between the living and the dead.
Mitt Romney's campaign is essentially plastic and dishonest, an insuperable problem Wednesday's debate in Mesa, Arizona, underscored yet again for disenchanted primary voters.

In science:

Simulation of a virtual qubits on a classical computer should not encounter any insuperable difficulties, as the operating program for quantum states modelling on a classical computer has been already developed .
An Algorithm of a Virtual Quantum Computer Model on a Classical Computer
The appearance here of the divergent ζ (1) seems to signal an insuperable barrier to extraction of a finite Casimir energy for finite λ.
The Casimir effect: Recent controversies and progress
There are no (insuperable) empirical obstacles to determining the status of objects in this scheme, and much of the cultural heat could be defused.
Planetesimals To Brown Dwarfs: What is a Planet?
If the higher-energy regime within which cosmological inflation occurs is described by a supersymmetric theory, there are new cosmological problems that initially seemed insuperable.
Dark Matter and Structure Formation in the Universe
However these problems may not be as insuperable as they appear.
Cosmological Parameters: do we already know the final answer ?