Highly unlikely
Impossible and highly unlikely are semantically related. In some cases you can use "Impossible" instead an adjective phrase "Highly unlikely".
Impossible
Impossible adjective - Incapable of being solved or accomplished.
Highly unlikely and impossible are semantically related. You can use "Highly unlikely" instead an adjective "Impossible".
Nearby Words: impossibility, impossibly
Mutual synonyms
Related pairs
- dubious and highly unlikely
- dubious and impossible
- doubtful and highly unlikely
- doubtful and impossible
- outrageous and highly unlikely
- outrageous and impossible
- implausible and highly unlikely
- implausible and impossible
- incredible and highly unlikely
- incredible and impossible
- unbelievable and highly unlikely
- unbelievable and impossible
- illogical and highly unlikely
- illogical and impossible
Both terms in one sentence
- The fact that time passes in the books but the characters stay the same age means that aspects of prior books become impossible or highly unlikely.
Source: Literature / The Bobbsey Twins - There are many cases of characters thinking that "the next time X happens will be the first", when X is something deemed impossible or highly unlikely.
Source: Literature / Timeline-191 -
Given that Time Travel is next to impossible in the setting it's highly unlikely they had anything to do with the subculture that created them.
Source: The Greys
Cite this Source
Impossible and Highly unlikely. (2016). Retrieved 2026, August 10, from https://thesaurus.plus/related/highly_unlikely/impossible
Highly unlikely & Impossible. N.p., 2016. Web. 10 Aug. 2026. <https://thesaurus.plus/related/highly_unlikely/impossible>.
Impossible or Highly unlikely. 2016. Accessed August 10, 2026. https://thesaurus.plus/related/highly_unlikely/impossible.
Google Ngram Viewer shows how "highly unlikely" and "impossible" have occurred on timeline