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Jyutping lik1 zai2
Pinyin lè zǎi

Definitions (Wiktionary)
  1. noun, Cantonese
    smart boy; smart kid; smart guy
  2. adj, Cantonese, of a boy
    smart

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Jyutping lek1 zai2
Pinyin lè zǎi

Definitions (粵典–words.hk)
  1. 名詞
    稱​讚​人​聰​明​、​細心
    clever boy; smart kid
  2. 名詞
    反諷​人醒​過龍​,​無​嗰​樣​搞​嗰​樣​,​結果​弄巧反拙
    used to criticise someone for thinking that they are very clever
    • 你真係叻仔嚟,喺考試拎滿分。
      你真系叻仔嚟,喺考试拎满分。
      You are such a good boy to get full marks in the exam.
Definitions (Kaifangcidian)
  1. 聰明人 – 聪明人
  2. 好樣的 – 好样的

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Jyutping lek1 zai2
Pinyin lè zǐ

Definitions (CC-CANTO)
  1. (n.) smart boy; smartass.
Examples (粵典–words.hk)
  1. Cantonese
    阿力系叻仔,我对佢有信心。
    阿力係叻仔,我對佢有信心。
    aa3 lik6 hai6 lek1 zai2, ngo5 deoi3 keoi5 jau5 seon3 sam1.
    • Alex is a smart guy. I trust him.
  2. Cantonese
    你真系叻仔嚟,喺考试拎满分。
    你真係叻仔嚟,喺考試拎滿分。
    • You are such a good boy to get full marks in the exam.
  3. Cantonese
    叻仔
    叻仔
    lek1 zai2
    • smart boy