未曽有

Etymology 1
Translation of.

Noun

 * 1) something that has never occurred before; unprecedented

Adjective

 * 1) unprecedented

Etymology 2
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From, above, using the kan’yōon reading of in. There is also an instance of the other kan’yōon reading of, without the dakuten.

Noun

 * 1) something that has never occurred before; unprecedented

Adjective

 * 1) unprecedented