Doubtful
Doubtful adjective - Not likely to be true or to occur.
Usage example: our winning the championship increasingly looks like a doubtful outcome
Impossible and doubtful are semantically related. in unlikely topic. In some cases you can use "Impossible" instead an adjective "Doubtful".
Impossible
Impossible adjective - Incapable of being solved or accomplished.
Usage example: fitting everything in my backpack seemed an impossible task
Doubtful and impossible are semantically related. Sometimes you can use "Doubtful" instead an adjective "Impossible".
Nearby Words: impossibility, impossibly
Both words in one sentence
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Unless a Romanization or Anglicization of the alphabet exists (which is doubtful), this is impossible, as you can't tell what a letter is supposed to sound like solely through what it looks like.
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Being able to 'retrieve' him in case of trouble was already doubtful in case of Elba (a small island) but virtually impossible in case of St.Helena where he was held by one of the potential enemies against which he would have been useful.
Source: Sealed Badass in a Can
Cite this Source
Impossible and Doubtful. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/doubtful/impossible
Doubtful & Impossible. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/doubtful/impossible>.
Impossible or Doubtful. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/doubtful/impossible.
Google Ngram Viewer shows how "doubtful" and "impossible" have occurred on timeline