noun
minute amount; tiny bit; the slightest
Literary or formal noun for an extremely small quantity, often used in negative or emphatic contexts to mean 'not even a tiny bit'. Rare in everyday speech; more common equivalents include 少しも or わずか.
彼の言葉には毫末の真実もなかった。
There was not a grain of truth in his words.
毫末の疑いもなく、それは彼の作品だ。
Without the slightest doubt, that is his work.