究极

究極
jiūjí

extremely; to the utmost

Wiktionary

Entry Composition

1 究 jiū
  1. after all
  2. to investigate
  3. to study carefully
  4. Taiwan pr. jiù
=2 极 jí
  1. extremely
  2. pole (geography, physics)
  3. utmost
  4. top
=2 极 jí
  1. (historical dictionaries only) wooden rack on donkey
  2. wooden rack on donkey