狂気の沙汰 きょうきのさた crazy deed; unbelievable deed; the height of madness; act of sheer madness exp col Advanced ➥
天才と狂人は紙一重 てんさいときょうじんはかみひとえ there's but a fine line between genius and insanity exp proverb Advanced ➥
狂 きょう (some type of) enthusiast suf somebody possessed of a (certain kind of) mental abnormality suf Advanced ➥