Correct
一问三不知
/ yī wèn sānbùzhī /
Strokes
Definition
lit. to reply "don't know" whatever the question (idiom)/fig. absolutely no idea of what's going on/complete ignorance
Example
Definition
say ‘I don't know' to every question—not know a thing; be entirely ignorant
1
Biè
别
wèn
问
tā
他
le
了
,
tā
他
zǒngshì
总是
yīwènsānbùzhī
一问三不知
。
Don't ask him any questions—he never knows the time of day.