馬鹿と天才は紙一重（ばかとてんさいはかみひとえ）

Japanese vocabulary

Meaning: there is but a fine line between genius and insanity

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “馬鹿と天才は紙一重” pronounced in real videos (YouGlish)