Correct

矻矻

/ kū kū / 
Strokes

Definition

assiduously

Example

As an Adjective

diligent; industrious; assiduous

1
Zīzīkūkū
孜孜矻矻

diligent; industrious

2
Zhōngrì
终日
kūkū
矻矻

work diligently/assiduously all day long