神出鬼沒 shén chū guǐ mò

DEFINITIONS

  1. lit. to appear and disappear unpredictably like a spirit or a ghost (idiom)
  2. fig. elusive

CHARACTERS

神 shén
HSK 5
spirit, god, supernatural being
出 chū
HSK 1
go out, send out; stand; produce
鬼 guǐ
HSK 5
ghost; spirit of dead; devil
沒 mò not, have not, none; to drown, sink