Sluggish
Sluggish adjective - Moving or proceeding at less than the normal, desirable, or required speed.
Unable and sluggish are semantically related. In some cases you can use "Unable" instead an adjective "Sluggish".
Nearby Words: sluggishness, sluggishly
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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Kirk is unable to harm the Gorn or stop its attempts to kill him (sluggish as they are) until he improvises a primitive cannon.
Source: Implacable Man -
Definitely Just a Cold: Yuuki starts getting increasingly absentminded and sluggish during the latter parts of Taes route and her epilogue, but everyone just sort of brushes it off until eventually he simply drops dead, his memory unable to be reconnected to his body.
Source: Visual Novel / Akatsuki No Goei
Cite this Source
Unable and Sluggish. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/sluggish/unable
Sluggish & Unable. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/sluggish/unable>.
Unable or Sluggish. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/sluggish/unable.
Google Ngram Viewer shows how "sluggish" and "unable" have occurred on timeline