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Jyutping lok6 ci2 bat1 pei4
Pinyin lè cǐ bù pí

Definitions (CC-CEDICT)
  1. to enjoy sth and never tire of it (idiom)
Definitions (粵典–words.hk)
  1. 動詞
    享受​做​一件​事​,​唔​覺​得​攰​或者​厭
    to enjoy doing something and not to feel tired or bored
    • 阿明個仔睇嚟睇去都係嗰幾本書,樂此不疲。
      阿明个仔睇嚟睇去都系𠮶几本书,乐此不疲。
      aa3 ming4 go3 zai2 tai2 lai4 tai2 heoi3 dou1 hai6 go2 gei2 bun2 syu1, lok6 ci2 bat1 pei4.
      Ming's son has only few books to read but he never feels bored.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to ardently love doing something and not feel tired because of it
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    阿明个仔睇嚟睇去都系𠮶几本书,乐此不疲。
    阿明個仔睇嚟睇去都係嗰幾本書,樂此不疲。
    aa3 ming4 go3 zai2 tai2 lai4 tai2 heoi3 dou1 hai6 go2 gei2 bun2 syu1, lok6 ci2 bat1 pei4.
    • Ming's son has only few books to read but he never feels bored.
Examples (Wiktionary)
  1. Mandarin
    乐此不疲
    樂此不疲
    lè cǐ bù pí
    • to never get tired of it