白費心思

白费心思
báifèixīnsī

to bother one's head for nothing

Wiktionary

Entry Composition

1 白費 báifèi to waste (one's energy etc)
=2 心思 xīnsi
  1. mind
  2. thoughts
  3. inclination
  4. mood
=2 心思 xīnsī
  1. feeling; mood; emotions; state of mind
  2. intentions; plans
  3. thinking
  4. thoughts; ideas