| 殚 |
dān jīng jí lǜ | to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly / to rack one's brains / to leave no stone unturned |
| 殚 |
dān | entirely / to exhaust |
| 精 |
jīng | essence / extract / vitality / energy / semen / sperm / mythical goblin spirit / highly perfected / elite / the pick of sth / proficient (refined ability) / extremely (fine) / selected rice (archaic) |
| 极 |
jí | extremely / pole (geography, physics) / utmost / top |
| 虑 |
lǜ | to think over / to consider / anxiety |