Incapable of
Unable and incapable of are semantically related. In some cases you can replace term "Unable" with "Incapable of", this terms are similar.
Unable
Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.
Incapable of and unable are semantically related. You can use "Incapable of" instead an adjective "Unable".
Both terms in one sentence
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Discworld: Brutha from Small Gods isn't so much incapable of lying as he is unable to understand the concept.
Source: Brutal Honesty - The one CPU that would inevitably be spawned here would be completely incapable of leaving it, being unable to figure out the bouncy bubbles used to propel yourself out.
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Naoko is incapable of getting properly aroused in sexual situations, and as a consequence is unable to have sex with Kizuki, even though she wants to.
Source: Literature / Norwegian Wood
Cite this Source
Unable and Incapable of. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/incapable_of/unable
Incapable of & Unable. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/incapable_of/unable>.
Unable or Incapable of. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/incapable_of/unable.
Google Ngram Viewer shows how "incapable of" and "unable" have occurred on timeline