Strengthen
Strengthen verb - To increase the ability of (as a muscle) to exert physical force.
Stiffened and strengthen are semantically related In some cases you can replace term "Stiffened" with "Strengthen", this verbs are similar.
Nearby Words: strength, strengthening
Stiffened
Stiffened adjective - Incapable of or highly resistant to bending.
Strengthen and stiffened are semantically related in make or become harder topic. You can use "Strengthen" instead a verb "Stiffened".
Nearby Words: stiff, stiffening
Cite this Source
Stiffened and Strengthen. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/strengthen/stiffened
Strengthen & Stiffened. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/strengthen/stiffened>.
Stiffened or Strengthen. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/strengthen/stiffened.
Google Ngram Viewer shows how "strengthen" and "stiffened" have occurred on timeline