頑敵 [顽敌]

Jyutping waan4 dik6
Pinyin wán dí

Definitions (CC-CANTO)
  1. a stubborn enemy; a tough enemy; an inveterate foe
Definitions (Wiktionary)
  1. noun
    stubborn enemy; inveterate
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）