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Jyutping hau2 bat1 zaak6 jin4
Pinyin kǒu bù zé yán

Definitions (CC-CEDICT)
  1. to speak incoherently
  2. to ramble
  3. to talk irresponsibly
Definitions (粵典–words.hk)
  1. 語句
    唔​考慮​恰當言語​就​衝口​而​出
    loud-mouthed; literally: mouth does not choose words
    • 佢口不擇言,成日得罪人。
      佢口不择言,成日得罪人。
      keoi5 hau2 bat1 zaak6 jin4, seng4 jat6 dak1 zeoi6 jan4.
      He often speaks nonsense and offends people.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to talk indiscreetly; to talk recklessly
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    嘢可以乱食,说话唔可以乱讲。情侣分手好多时就系因为啲人口不择言。
    嘢可以亂食,説話唔可以亂講。情侶分手好多時就係因為啲人口不擇言。
    je5 ho2 ji5 lyun6 sik6, syut3 waa6 m4 ho2 ji5 lyun6 gong2. cing4 leoi5 fan1 sau2 hou2 do1 si4 zau6 hai6 jan1 wai6 di1 jan4 hau2 bat1 zaak6 jin4.
    • you can eat without thinking, but you should not talk in the same way. Many lovers break up because of faux passes.
  2. Cantonese
    佢口不择言,成日得罪人。
    佢口不擇言,成日得罪人。
    keoi5 hau2 bat1 zaak6 jin4, seng4 jat6 dak1 zeoi6 jan4.
    • He often speaks nonsense and offends people.