Make difficult
Strengthen and make difficult are semantically related. in harden topic. In some cases you can use "Strengthen" instead a verb phrase "Make difficult".
Strengthen
Strengthen verb - To increase the ability of (as a muscle) to exert physical force.
Make difficult and strengthen are semantically related. You can use "Make difficult" instead a verb "Strengthen".
Nearby Words: strength, strengthening
Cite this Source
Strengthen and Make difficult. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/make_difficult/strengthen
Make difficult & Strengthen. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/make_difficult/strengthen>.
Strengthen or Make difficult. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/make_difficult/strengthen.
Google Ngram Viewer shows how "make difficult" and "strengthen" have occurred on timeline