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Jyutping jan2 gwan1 zi2
Pinyin yǐn jūn zǐ

Definitions (粵典–words.hk)
  1. 名詞
    患有​毒​癮​嘅​人​嘅​別​稱​(​量​詞​:​個​/​名​)
    drug addict
    • 佢癮君子嚟,唔好畀錢佢。
      佢瘾君子嚟,唔好畀钱佢。
      keoi5 jan5 gwan1 zi2 lai4, m4 hou2 bei2 cin2 keoi5.
      Don't give him money. He's a drug addict.

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Jyutping jan5 gwan1 zi2
Pinyin yǐn jūn zǐ

Definitions (CC-CEDICT)
  1. opium eater
  2. drug addict
  3. chain smoker
Definitions (Wiktionary)
  1. noun, derogatory
    someone who is addicted to smoking or using illicit drugs; chain smoker; drug addict
    (syn.) 白粉仙, 道友, 白粉友 heroin addict, 白粉佬 heroin addict, 白粉仔 heroin addict, 吸毒者, 吸毒人, 癮煙, 吃毒的人, 癮君子, 吸毒鬼, 白粉仔
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    美国的罪犯大多是吸毒成瘾的瘾君子。
    美國的罪犯大多是吸毒成癮的癮君子。
    měi guó de zuì fàn dà duō shì xī dú chéng yǐn de yǐn jūn zǐ 。
    • Many criminals in America are addicted to drugs.
    • Many criminals in the United States are addicted to drugs.
Examples (粵典–words.hk)
  1. Cantonese
    佢瘾君子嚟,唔好畀钱佢。
    佢癮君子嚟,唔好畀錢佢。
    keoi5 jan5 gwan1 zi2 lai4, m4 hou2 bei2 cin2 keoi5.
    • Don't give him money. He's a drug addict.