Unsound and Unstable

Unsound

Unsound adjective - Suffering from severe mental illness.
Usage example: of unsound mind

Unstable is a synonym for unsound in disordered topic. In some cases you can use "Unstable" instead an adjective "Unsound", when it comes to topics like flimsy, rickety. popular alternative

Nearby Words: unsounded, unsoundly

Unstable

Unstable adjective - Not being in or able to maintain a state of balance.
Usage example: the minute we put the books down on the unstable desk, the whole stack went crashing to the floor

Unsound is a synonym for unstable. You can use "Unsound" instead an adjective "Unstable". popular alternative

Nearby Word: unstably
Cite this Source
Unstable and Unsound. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/unsound/unstable
Unsound & Unstable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/unsound/unstable>.
Unstable or Unsound. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/unsound/unstable.
Google Ngram Viewer shows how "unsound" and "unstable" have occurred on timeline