"regrettably." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/regrettably>.
regrettably. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/regrettably
(comparative more regrettably, superlative most regrettably)
regrettable +"Ž -ly
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