有頭無尾 [－头无－]

Jyutping jau5 tau4 mou4 mei5
Pinyin yǒu tóu wú wěi

Definitions (CC-CEDICT)
  1. (idiom) to fail to finish off what one started
Definitions (Wiktionary)
  1. phrase, idiomatic
    to have a beginning but not an end; to fail to carry things through; to leave something unfinished
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）