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
Nearby Words: improbability, improbably
Probable
Probable adjective - Worthy of being accepted as true or reasonable.
Usage example: the counselor could find no probable reason for the girl's bizarre actions
Both words in one sentence
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He did it by making an (im)probability probable and improbable at the same time (the ship was the Heart of Gold, which ran on the Improbability drive: Long story short, anything happening/going somewhere which is improbable becomes probable, which is how it got to places that were improbable).
Source: Logic Bomb -
When done right, the improbable consequence will be a close analogy or a sharp metaphor to the probable one - just increased in scale, speed, or concreteness.
Source: Space Whale Aesop - Craig has a lot of it too, usually involved with his improbable trouble with girls or his more probable trouble with family.
Source: Jerkass Woobie / Live-Action TV
Cite this Source
Probable and Improbable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/improbable/probable
Improbable & Probable. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/improbable/probable>.
Probable or Improbable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/improbable/probable.
Google Ngram Viewer shows how "improbable" and "probable" have occurred on timeline