Improbable
Improbable adjective - Not likely to be true or to occur.
Usage example: it seems improbable that the two writers never met since they traveled in the same social circles
Impossible is a synonym for improbable. In some cases you can use "Impossible" instead an adjective "Improbable".
Nearby Words: improbability, improbably
Impossible
Impossible adjective - Incapable of being solved or accomplished.
Usage example: fitting everything in my backpack seemed an impossible task
Nearby Words: impossibility, impossibly
Mutual synonyms
Related pairs
- dubious and improbable
- dubious and impossible
- questionable and improbable
- questionable and impossible
- doubtful and improbable
- doubtful and impossible
- implausible and improbable
- implausible and impossible
- incredible and improbable
- incredible and impossible
- unbelievable and improbable
- unbelievable and impossible
- fantastic and improbable
- fantastic and impossible
Cite this Source
Impossible and Improbable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/improbable/impossible
Improbable & Impossible. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/improbable/impossible>.
Impossible or Improbable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/improbable/impossible.
Google Ngram Viewer shows how "improbable" and "impossible" have occurred on timeline