(comparative more unfrivolously, superlative most unfrivolously)
unfrivolous + -ly
"unfrivolously." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/unfrivolously>.
unfrivolously. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/unfrivolously
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