有始無終 [－－无终]

Jyutping jau5 ci2 mou4 zung1
Pinyin yǒu shǐ wú zhōng

Definitions (CC-CEDICT)
  1. to start but not finish (idiom); to fail to carry things through
  2. lack of sticking power
  3. short attention span
Definitions (Wiktionary)
  1. phrase, idiomatic
    to have a beginning but not an end
  2. phrase, idiomatic
    to start something but fail to carry it through; to begin well but end badly
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）