来路不明 lái lù bù míng

DEFINITIONS

  1. unidentified origin
  2. no-one knows where it comes from
  3. of dubious background

CHARACTERS

来 lái
HSK 1
come, coming; return, returning
路 lù
HSK 2
road, path, street; journey
不 bù
HSK 1
no, not; un-; negative prefix
明 míng
HSK 1
bright, light, brilliant; clear