黑燈瞎火 [－灯－－]

Jyutping hak1 dang1 hat6 fo2
Pinyin hēi dēng xiā huǒ

Definitions (CC-CEDICT)
  1. pitch dark
Definitions (Wiktionary)
  1. adj
    lacking illumination; dark
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）