望洋興嘆 [－－兴叹]

Jyutping mong6 joeng4 hing1 taan3
Pinyin wàng yáng xīng tàn

Definitions (CC-CEDICT)
  1. lit. to gaze at the ocean and lament one's inadequacy (idiom)
  2. fig. to feel powerless and incompetent (to perform a task)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to lament one's littleness in face of something vast and great; to feel powerless in face of a great task