Unstable
Unstable adjective - Not being in or able to maintain a state of balance.
Weak knees and unstable are semantically related. In some cases you can use "Weak knees" instead an adjective "Unstable".
Nearby Word: unstably
Weak knees
Unstable and weak knees are semantically related. Sometimes you can use "Unstable" instead an adjective phrase "Weak knees".
Cite this Source
Weak knees and Unstable. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/unstable/weak_knees
Unstable & Weak knees. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/unstable/weak_knees>.
Weak knees or Unstable. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/unstable/weak_knees.
Google Ngram Viewer shows how "unstable" and "weak knees" have occurred on timeline