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Jyutping deon6 toi1
Pinyin dùn tāi

Definitions (粵典–words.hk)
  1. 名詞
    天生​反應​極之遲​鈍​嘅​人
    a person who is very dump since birth and not able to improve. Literally: dump embryo
    • 見我燶口燶面 咗成日都仲唔識氹返人,我條仔正一鈍胎嚟㗎!
      见我㶶口㶶面 咗成日都仲唔识氹返人,我条仔正一钝胎嚟㗎!
      gin3 ngo5 nung1 hau2 nung1 min6 zo2 seng4 jat6 dou1 zung6 m4 sik1 tam3 faan1 jan4, ngo5 tiu4 zai2 zing3 jat1 deon6 toi1 lai4 gaa3!
      I scowled at my boyfriend for a whole day and he even did not realise he should make me happy. He is just that kind of very dump since birth!
Definitions (Wiktionary)
  1. noun, Cantonese
    idiot; dunce (Classifier: 個/个)
Examples (粵典–words.hk)
  1. Cantonese
    见我㶶口㶶面 咗成日都仲唔识氹返人,我条仔正一钝胎嚟㗎!
    見我燶口燶面 咗成日都仲唔識氹返人,我條仔正一鈍胎嚟㗎!
    gin3 ngo5 nung1 hau2 nung1 min6 zo2 seng4 jat6 dou1 zung6 m4 sik1 tam3 faan1 jan4, ngo5 tiu4 zai2 zing3 jat1 deon6 toi1 lai4 gaa3!
    • I scowled at my boyfriend for a whole day and he even did not realise he should make me happy. He is just that kind of very dump since birth!