Correct

灰不溜丢

/ huī bù liū diū /
Strokes

Definition

gloomy and dull (idiom)/boring and gray/unpleasantly murky

Example

As an Adjective

dispirited; down-hearted; gloomy

1
Biè
yīn
shībài
失败
jiù
huī
liū
diū
de
tái
tóu
lái
  

Don't be dispirited because of one failure. Hold your head high!

As an Adjective

greyish

2
dài
shang
dǐng
huī
liū
diū
de
màozi
帽子
tǐng
huá
滑稽
de
  

He looks rather funny with that greyish cap on.