Origin
vigourous + -ness
vigourousness
English Wiktionary. Available under CC-BY-SA license.
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"vigourousness." YourDictionary, n.d. Web. 18 January 2019. <https://www.yourdictionary.com/vigourousness>.
APA Style
vigourousness. (n.d.). Retrieved January 18th, 2019, from https://www.yourdictionary.com/vigourousness
