Invalid
Invalid adjective - Chronically or repeatedly suffering from poor health.
Unable and invalid are semantically related in defenceless topic. In some cases you can use "Unable" instead an adjective "Invalid".
Unable
Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.
Invalid and unable are semantically related in defenceless topic. Sometimes you can use "Invalid" instead an adjective "Unable".
Mutual synonyms
Both words in one sentence
- However, when Terry investigates the old villain's home, he finds Bane is now an invalid, due to a lifetime of using the stuff, clearly unable to run such an operation.
Cite this Source
Unable and Invalid. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/invalid/unable
Invalid & Unable. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/invalid/unable>.
Unable or Invalid. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/invalid/unable.
Google Ngram Viewer shows how "invalid" and "unable" have occurred on timeline