未遂みすい Common Noun Noun Noun English jmdict 1 noun (common) (futsuumeishi)nounnouns which may take the genitive case particle 'no' failed attempt (at a crime, suicide, etc.) See also: 既遂 (きすい) 彼は自殺しようとしたが、未遂に終わった。 He tried to kill himself but it ended in failure.