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Jyutping hau4 mat6
Pinyin kǒu mì

Definitions (粵典–words.hk)
  1. 形容詞
    唔​會​輕易​泄露秘密
    tight-lipped; closemouthed
    • 同我講你鐘意邊個啦,放心,我好口密。
      同我讲你钟意边个啦,放心,我好口密。
      tung4 ngo5 gong2 nei5 zung1 ji3 bin1 go3 laa1, fong3 sam1, ngo5 hou2 hau4 mat6.
      Just tell me who you are falling in love with. Trust me, I will close my mouth.

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Jyutping hau2 mat6
Pinyin kǒu mì

Definitions (CC-CANTO)
  1. tight-lipped, someone who doesn't like talking or gossiping; good in keeping secret
Definitions (Wiktionary)
  1. adj, Cantonese, of a person
    tight-lipped; closemouthed
    (syn.) 嘴严, 嘴嚴
Definitions (Kaifangcidian)
  1. 嚴實 – 严实
  2. 嘴嚴 – 嘴严
  3. 口緊 – 口紧
  4. 謹言 – 谨言
  5. 嘴巴嚴 – 嘴巴严
  6. 沉默寡言
  7. 不愛說話 – 不爱说话
  8. 守口如瓶
  9. 保守機密 – 保守机密
  10. 不愛多說話 – 不爱多说话
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    日本的人口密度很高。
    日本的人口密度很高。
    rì běn de rén kǒu mì dù hěn gāo 。
    • Japan has a high population density.
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    日本嘅人口密度好高。
    日本嘅人口密度好高。
    jat6 bun2 ge3 jan4 hau2 mat6 dou6 hou3 gou1 。
    • Japan has a high population density.
Examples (粵典–words.hk)
  1. Cantonese
    人口密度
    人口密度
    jan4 hau2 mat6 dou6
    • population density
  2. Cantonese
    同我讲你钟意边个啦,放心,我好口密。
    同我講你鐘意邊個啦,放心,我好口密。
    tung4 ngo5 gong2 nei5 zung1 ji3 bin1 go3 laa1, fong3 sam1, ngo5 hou2 hau4 mat6.
    • Just tell me who you are falling in love with. Trust me, I will close my mouth.
Examples (Wiktionary)
  1. Mandarin
    人口密集
    人口密集
    rén kǒu mì jí
    • densely populated