huī​bu​liū​diū

dull gray

Senses

灰不溜丢/ 灰不溜丟 huī​bu​liū​diū (also huī​bù​liū​diū) dull gray

colloquial expression for a color that is unpleasantly gray, murky, or lacking luster; can also describe something dreary, low-class, or boring

References

synonym 灰不溜丢/灰不溜丟 灰不溜秋/灰不溜秋
variant 灰不溜秋/灰不溜秋 灰不溜丢/灰不溜丟