HSK V7-9
Correct

不知

/ bùzhī / 
Strokes

Definition

not to know/unaware/unknowingly/fig. not to admit (defeat, hardships, tiredness etc)

Example

As a Verb
not know
1
Bùzhī
不知
píjuàn
疲倦
de
的
gōngrén
工人

untiring worker