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Jyutping muk6 bat1 sik1 ding1
Pinyin mù bù shì dīng

Definitions (Wiktionary)
  1. phrase, derogatory, idiomatic
    to not even know the most basic characters; to be densely illiterate

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Jyutping muk6 bat1 sik1 ding1
Pinyin mù bù shí dīng

Definitions (CC-CEDICT)
  1. lit. the eye cannot recognize the letter T (idiom); totally illiterate
Definitions (粵典–words.hk)
  1. 語句
    連​「​丁​」​字​咁​簡​單​嘅​字​都​唔​識​;​形容​一個​人​一​隻​字​都​唔​識​,​係​個​文盲
    to be completely illiterate; literally 'to have eyes that don't even recognise the (simple) character 丁'
    • 佢小學都未讀完,目不識丁。
      佢小学都未读完,目不识丁。
      keoi5 siu2 hok6 dou1 mei6 duk6 jyun4, muk6 bat1 sik1 ding1.
      He hadn't even finished primary school and is completely illiterate.
  2. 近義詞
    盲字都唔識多隻
Definitions (Wiktionary)
  1. phrase, derogatory, idiomatic
    to not even know the most basic characters; to be densely illiterate
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    佢小学都未读完,目不识丁。
    佢小學都未讀完,目不識丁。
    keoi5 siu2 hok6 dou1 mei6 duk6 jyun4, muk6 bat1 sik1 ding1.
    • He hadn't even finished primary school and is completely illiterate.