The exact origin of the phrase "in no uncertain terms" is not well-documented, but it has been in use for well over a century. It likely evolved from the notion that clear and direct language leaves no room for doubt or misunderstanding, emphasizing the absence of uncertainty. It is used to emphasize that something is stated clearly, directly, and without any ambiguity or room for misinterpretation.

英語での「in no uncertain terms」の定義と意味

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