This type of rhetorical figure of speech, a form of understatement, is called litotes.
"not-bad." YourDictionary, n.d. Web. 09 November 2018. <https://www.yourdictionary.com/not-bad>.
not-bad. (n.d.). Retrieved November 09th, 2018, from https://www.yourdictionary.com/not-bad
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