Litotes

[lahy-tuh-teez, lit-uh-, lahy-toh-teez] /ˈlaɪ təˌtiz, ˈlɪt ə-, laɪˈtoʊ tiz/

noun, plural litotes. Rhetoric.
1.
understatement, especially that in which an affirmative is expressed by the negative of its contrary, as in “not bad at all.”.
/ˈlaɪtəʊˌtiːz/
noun (pl) -tes
1.
understatement for rhetorical effect, esp when achieved by using negation with a term in place of using an antonym of that term, as in “She was not a little upset” for “She was extremely upset.”
n.

rhetorical figure in which an affirmative is expressed by the negative of its opposite, from Greek litotes, literally “plainness, simplicity,” from litos “smooth, plain, small, meager,” from PIE root *(s)lei- “slimy, sticky, slippery” (hence “smooth”); see slime (n.).

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