Invalid and Unsustainable

Invalid

Invalid adjective - Chronically or repeatedly suffering from poor health.

Unsustainable and invalid are semantically related. In some cases you can use "Unsustainable" instead an adjective "Invalid".

Unsustainable

Definitions of Invalid not found.

Invalid and unsustainable are semantically related. Sometimes you can use "Invalid" instead an adjective "Unsustainable".
Cite this Source
Unsustainable and Invalid. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/invalid/unsustainable
Invalid & Unsustainable. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/invalid/unsustainable>.
Unsustainable or Invalid. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/invalid/unsustainable.
Google Ngram Viewer shows how "invalid" and "unsustainable" have occurred on timeline