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Jyutping bat1 sam6
Pinyin bù shèn

Definitions (Wiktionary)
  1. adv, literary
    not very
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.