(comparative more doubtfull, superlative most doubtfull)
"doubtfull." YourDictionary, n.d. Web. 28 May 2019. <https://www.yourdictionary.com/doubtfull>.
doubtfull. (n.d.). Retrieved May 28th, 2019, from https://www.yourdictionary.com/doubtfull
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