Impossible
Impossible noun - Something that cannot be done.
Possibility is an antonym for impossible.
Nearby Words: impossibility, impossibly
Possibility
Possibility noun - Something that can develop or become actual.
Both words in one sentence
- Similar to the sunk-costs fallacy; having a particular goal in mind and refusing to give up on it, however impossible it seems, while also ignoring the possibility of doing even better.
Source: Cab Driver's Fallacy - Chekhov's Gun: Midway through, the possibility of empathically-powered weapons are brought up only to be dismissed as impossible.
Source: Roleplay / AsteroidQuest -
In some cases, they are almost impossible to kill, because if even one of the creatures that makes up its body survives, there is the possibility that it will return (though it may take a while).
Source: The Worm That Walks
Cite this Source
Possibility and Impossible. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/impossible/possibility
Impossible & Possibility. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/impossible/possibility>.
Possibility or Impossible. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/impossible/possibility.
Google Ngram Viewer shows how "impossible" and "possibility" have occurred on timeline