Unsustainable
Weak and unsustainable are semantically related. In some cases you can use "Weak" instead an adjective "Unsustainable".
Weak
Weak adjective - Lacking bodily strength.
Unsustainable and weak are semantically related. You can use "Unsustainable" instead an adjective "Weak".
Mutual synonyms
Cite this Source
Weak and Unsustainable. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/unsustainable/weak
Unsustainable & Weak. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/unsustainable/weak>.
Weak or Unsustainable. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/unsustainable/weak.
Google Ngram Viewer shows how "unsustainable" and "weak" have occurred on timeline