冥思苦索 míng sī kǔ suǒ

DEFINITIONS

  1. to mull over (idiom)
  2. to think long and hard

CHARACTERS

冥 míng dark, gloomy, night; deep
思 sī
HSK 2
think, consider, ponder; final particle
苦 kǔ
HSK 4
bitter; hardship, suffering
索 suǒ
HSK 5
large rope, cable; rules, laws; to demand, to exact; to search, inquire; isolated