Sudden
Sudden adjective - Not expected.
Unable and sudden are semantically related. In some cases you can use "Unable" instead an adjective "Sudden".
Nearby Words: suddenly, suddenness
Unable
Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.
Both words in one sentence
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In a moment of sudden desperation he leaps from an apartment window, only to break most of his bones and wind up immobile and unable to talk in the hospital instead of dead.
Source: Bungled Suicide -
Unable to cope with sudden success and the balance of fatherhood (he's the father of Freddie Prinze Jr.), he turned to drugs ... and eventually bought a gun.
Source: Series / Chico And The Man - The Doctor spent the majority of the new series's first Christmas special in a post-regenerative coma, unable to help his friends and the entire mankind as the world faced a sudden alien invasion.
Source: Deus Exit Machina
Cite this Source
Unable and Sudden. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/sudden/unable
Sudden & Unable. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/sudden/unable>.
Unable or Sudden. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/sudden/unable.
Google Ngram Viewer shows how "sudden" and "unable" have occurred on timeline