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