渾然不知 hún rán bù zhī

DEFINITIONS

  1. to be totally oblivious (to sth)
  2. to have no idea about sth

CHARACTERS

渾 hún muddy, turbid; blend, merge, mix
然 rán
HSK 2
yes, certainly; pledge, promise
不 bù
HSK 1
no, not; un-; negative prefix
知 zhī
HSK 2
know, perceive, comprehend