Jyutping
zi1 kei4 bat1 ho2 ji4 wai4
Pinyin
zhī qí bù kě ér wéi
Definitions (Wiktionary)
phrase, idiomatic
to (stubbornly) do something even though you know it is impossible; to understand the difficulty of a feat but to attempt it anyway because it is the right thing to do (e.g. strive to eliminate world hunger) (syn.) 知其不可而為之, 知其不可為而為之, 知其不可而为之, 知其不可为而为之