Dubious
Dubious adjective - Giving good reason for being doubted, questioned, or challenged.
Highly unlikely and dubious are semantically related. In some cases you can use "Highly unlikely" instead an adjective "Dubious".
Highly unlikely
Dubious and highly unlikely are semantically related. Sometimes you can use "Dubious" instead an adjective phrase "Highly unlikely".
Mutual synonyms
Cite this Source
Highly unlikely and Dubious. (2016). Retrieved 2026, August 09, from https://thesaurus.plus/related/dubious/highly_unlikely
Dubious & Highly unlikely. N.p., 2016. Web. 09 Aug. 2026. <https://thesaurus.plus/related/dubious/highly_unlikely>.
Highly unlikely or Dubious. 2016. Accessed August 09, 2026. https://thesaurus.plus/related/dubious/highly_unlikely.
Google Ngram Viewer shows how "dubious" and "highly unlikely" have occurred on timeline