回味無窮 [－－无穷]

Jyutping wui4 mei6 mou4 kung4
Pinyin huí wèi wú qióng

Definitions (CC-CEDICT)
  1. to have a rich aftertaste
  2. (fig.) memorable; to linger in one's memory
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    leaving a rich aftertaste; (figuratively) memorable, lingering in memory