不知凡幾 bù zhī fán jǐ

DEFINITIONS

  1. one can't tell how many
  2. numerous similar cases

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
知 zhī
HSK 2
know, perceive, comprehend
凡 fán
HSK 6
all, any, every; ordinary, common
幾 jǐ how many? how much?; a few, some