Correct

不阴不阳

/ bù yīn bù yáng /
Strokes

Example

Definition

take an ambiguous/equivocal attitude; be sinister and mystifying/queer

1
shénqíng
神情
yīnyáng
阴不阳
  
,
xiǎng
gǎo
shénme
什么
míngtang
名堂
  
?

She looks mystifying. What trick is she up to?