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Jyutping sam1 zik6 zeoi2 faai3
Pinyin xīn zhí zuǐ kuài

Definitions (CC-CEDICT)
  1. frank and outspoken
  2. straight speaking
  3. to say what one thinks
Definitions (Wiktionary)
  1. phrase, idiomatic, uncommon
    Synonym of 心直口快 (xīnzhíkǒukuài, “frank and outspoken; plainspoken and straightforward”).
    (syn.) 心直口快