Flat
Unable
Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.
Mutual synonyms
Both words in one sentence
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Episode 21, "The Bees": Alfred lends his money to King Franz Ferdinand, not knowing that the royal family is flat broke and unable to pay him back.
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The best-known examples are the title characters in Waverley and Ivanhoe (the latter famously spends a battle sequence flat on his back in a tower, unable to see anything that's going on).
Source: Creator / Walter Scott -
Maggie is unable to stand up straight for long and usually falls down flat with a thud.
Source: Creator / Matt Groening
Cite this Source
Unable and Flat. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/flat/unable
Flat & Unable. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/flat/unable>.
Unable or Flat. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/flat/unable.
Google Ngram Viewer shows how "flat" and "unable" have occurred on timeline