一筆不苟

Simplified: 一笔不苟

yībǐbùgǒu ㄧ ㄅㄧˇ ㄅㄨˋ ㄍㄡˇ

    • lit. not even one stroke is negligent (idiom)
    • fig. to write characters (calligraphy) in which every stroke is placed perfectly

Character by character

Sources