完かん全ぜん犯はん罪ざいかんぜんはんざいMeanings1nounperfect crimeA crime committed without leaving any evidence, making it impossible to solve or prosecute.彼かれは完かん全ぜん犯はん罪ざいを計けい画かくしたが、小ちいさなミスで捕つかまっ