Harden
Harden verb - To make able to withstand physical hardship, strain, or exposure.
Usage example: pioneer women who had been hardened by years of living on the plains
Strengthen is a synonym for harden in reinforce topic. In some cases you can use "Strengthen" instead a verb "Harden", when it comes to topics like ossify, stiffen, strong, fortify. popular alternative
Strengthen
Strengthen verb - To increase the ability of (as a muscle) to exert physical force.
Usage example: the army makes new recruits run for miles in order to strengthen them
Harden is a synonym for strengthen in fortify topic. You can use "Harden" instead a verb "Strengthen", if it concerns topics such as encourage, process, support, ossify. popular alternative
Nearby Words: strength, strengthening
Mutual synonyms
Common collocations
Both words in one sentence
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Two other types of Haki (that can be learned) enable users to gain split-second precognition and harden their defenses or strengthen attacks to harm immaterial or Haki-using enemies, but only one in a million inherently awesome people can use the Conqueror's Haki.
Source: Awesomeness Is a Force
Cite this Source
Strengthen and Harden. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/harden/strengthen
Harden & Strengthen. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/harden/strengthen>.
Strengthen or Harden. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/harden/strengthen.
Google Ngram Viewer shows how "harden" and "strengthen" have occurred on timeline