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Jyutping bat1 sam6 liu5 liu5
Pinyin bù shèn liǎo liǎo

Definitions (粵典–words.hk)
  1. 語句
    唔​係​好​清楚​,​ ​唔​係​好​明白
    not understanding thoroughly; not quite clear in one's mind
    • 我對呢件事真係不甚了了。
      我对呢件事真系不甚了了。
      ngo5 deoi3 ni1 gin6 si6 zan1 hai6 bat1 sam6 liu5 liu5.
      I don't know this incident quite well.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to not know much about something; to be unclear about something
Examples (粵典–words.hk)
  1. Cantonese
    我对呢件事真系不甚了了。
    我對呢件事真係不甚了了。
    ngo5 deoi3 ni1 gin6 si6 zan1 hai6 bat1 sam6 liu5 liu5.
    • I don't know this incident quite well.