impossible
Viewing an actual atom was like trying to touch the sun, a physical impossibility.
I think it's almost an impossibility to stamp out deformed genes.
Recognizing the impossibility of attaining their ideals in England, they planned to settle in America.

SMART Vocabulary: related words and phrases

Unachievable
be (a) no goidiom
be on a hiding to nothingidiom
be on the road to nowhereidiom
be out of your leagueidiom
cat
ghost
goodbye
impossible
impracticable
impracticably
in/out of the runningidiom
infeasible
league
running
silk
unattainable
unfeasible
unfeasibly
unrealizable
unscalable

impossibility | American Dictionary

impossibility
noun[ C ]
us/ɪmˌpɑs·əˈbɪl·ɪ·t̬i/
something that is not possible:
What you’re asking for is an impossibility.

Examples of impossibility

impossibility
Well, perhaps there is none, if it is some bare logical or metaphysical impossibility that is being asked about.
We are thus dealing with an impossibility that can only ever be instantiated or 'positivized' approximately.
States referred to the diversity of indigenous peoples and the consequent difficulty, even impossibility, of a universal definition.
What it does make perfectly clear is the impossibility of humanity's well-being under capitalism, and why.
The main problem is then the practical impossibility to compute all combinations for even relatively small corpora.
Instead, they examine the much narrower question of whether pre-vote deliberation can help avoid social-choicetheoretic impossibility results.
The impossibility of human persons beginning to exist more than once yields a bump in the physicalist's road to an afterlife.
She is referring to the impossibility of their future lives together; they enjoy thinking about it, but know that it won't work.
The evident character of intuitive knowledge contrasts with the impossibility of passing this knowledge on or of explaining it.
The writing of 1848-52 'knows' the impossibility of its ambition to find an audience, to be properly heard.
Needless to say, this idea of a reception-politics has its own problems : on one set of assumptions, indeed, it amounts to a dangerous impossibility.
But if he illustrates the impossibility of objective historical inquiry, then the loss to historiography is the gain of political thought.
The whole issue needs be approached in a practical, positive spirit, considering spelling reform as an international opportunity, not an international impossibility.
This book is important because it reminds us that wilderness protection requires timely and visionary action before it becomes a political and material impossibility.
For all that we can see, it is a bona fide ordinary impossibility.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.