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Synonyms for Toughen. (2016). Retrieved 2020, April 02, from https://thesaurus.plus/synonyms/toughen
Synonyms for Toughen. N.p., 2016. Web. 02 Apr. 2020. <https://thesaurus.plus/synonyms/toughen>.
Synonyms for Toughen. 2016. Accessed April 02, 2020. https://thesaurus.plus/synonyms/toughen.