understatement

American  

[uhn-der-steyt-muhnt, uhn-der-steyt-] / ˌʌn dərˈsteɪt mənt, ˈʌn dərˌsteɪt- /

noun

1. the act or an instance of understating, or representing in a weak or restrained way that is not borne out by the facts.

   The journalist wrote that the earthquake had caused some damage. This turned out to be a massive understatement of the devastation.

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understatement Cultural  

1. A form of irony in which something is intentionally represented as less than it is: “Hank Aaron was a pretty good ball player.”

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Etymology

Origin of understatement

under- + statement